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Commit 55be062d authored by Jesse Brandeburg's avatar Jesse Brandeburg
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e1000: update the readme with the latest text 

The text of the e1000.txt file is a little stale, lets freshen it up.
(update) removed some non-kernel specific text
Signed-off-by: default avatarJesse Brandeburg <jesse.brandeburg@intel.com>
parent 823f8dd1
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Documentation/networking/e1000.txt
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Linux* Base Driver for the Intel(R) PRO/1000 Family of Adapters Linux* Base Driver for the Intel(R) PRO/1000 Family of Adapters
=============================================================== ===============================================================
November 17, 2004 November 15, 2005
Contents Contents
...@@ -20,13 +20,27 @@ In This Release ...@@ -20,13 +20,27 @@ In This Release
=============== ===============
This file describes the Linux* Base Driver for the Intel(R) PRO/1000 Family This file describes the Linux* Base Driver for the Intel(R) PRO/1000 Family
of Adapters, version 5.x.x. of Adapters. This driver includes support for Itanium(R)2-based systems.
For questions related to hardware requirements, refer to the documentation For questions related to hardware requirements, refer to the documentation
supplied with your Intel PRO/1000 adapter. All hardware requirements listed supplied with your Intel PRO/1000 adapter. All hardware requirements listed
apply to use with Linux. apply to use with Linux.
Native VLANs are now available with supported kernels. The following features are now available in supported kernels:
- Native VLANs
- Channel Bonding (teaming)
- SNMP
Channel Bonding documentation can be found in the Linux kernel source:
/Documentation/networking/bonding.txt
The driver information previously displayed in the /proc filesystem is not
supported in this release. Alternatively, you can use ethtool (version 1.6
or later), lspci, and ifconfig to obtain the same information.
Instructions on updating ethtool can be found in the section "Additional
Configurations" later in this document.
Identifying Your Adapter Identifying Your Adapter
======================== ========================
...@@ -42,12 +56,12 @@ networking link on the left to search for your adapter: ...@@ -42,12 +56,12 @@ networking link on the left to search for your adapter:
http://downloadfinder.intel.com/scripts-df/support_intel.asp http://downloadfinder.intel.com/scripts-df/support_intel.asp
Command Line Parameters
=======================
If the driver is built as a module, the following optional parameters are Command Line Parameters =======================
used by entering them on the command line with the modprobe or insmod command
using this syntax: If the driver is built as a module, the following optional parameters
are used by entering them on the command line with the modprobe or insmod
command using this syntax:
modprobe e1000 [<option>=<VAL1>,<VAL2>,...] modprobe e1000 [<option>=<VAL1>,<VAL2>,...]
...@@ -57,217 +71,265 @@ For example, with two PRO/1000 PCI adapters, entering: ...@@ -57,217 +71,265 @@ For example, with two PRO/1000 PCI adapters, entering:
insmod e1000 TxDescriptors=80,128 insmod e1000 TxDescriptors=80,128
loads the e1000 driver with 80 TX descriptors for the first adapter and 128 TX loads the e1000 driver with 80 TX descriptors for the first adapter and 128
descriptors for the second adapter. TX descriptors for the second adapter.
The default value for each parameter is generally the recommended setting, The default value for each parameter is generally the recommended setting,
unless otherwise noted. Also, if the driver is statically built into the unless otherwise noted.
kernel, the driver is loaded with the default values for all the parameters.
Ethtool can be used to change some of the parameters at runtime.
NOTES: For more information about the AutoNeg, Duplex, and Speed NOTES: For more information about the AutoNeg, Duplex, and Speed
parameters, see the "Speed and Duplex Configuration" section in parameters, see the "Speed and Duplex Configuration" section in
this document. this document.
For more information about the InterruptThrottleRate, RxIntDelay, For more information about the InterruptThrottleRate,
TxIntDelay, RxAbsIntDelay, and TxAbsIntDelay parameters, see the RxIntDelay, TxIntDelay, RxAbsIntDelay, and TxAbsIntDelay
application note at: parameters, see the application note at:
http://www.intel.com/design/network/applnots/ap450.htm http://www.intel.com/design/network/applnots/ap450.htm
A descriptor describes a data buffer and attributes related to the A descriptor describes a data buffer and attributes related to
data buffer. This information is accessed by the hardware. the data buffer. This information is accessed by the hardware.
AutoNeg (adapters using copper connections only)
AutoNeg
-------
(Supported only on adapters with copper connections)
Valid Range: 0x01-0x0F, 0x20-0x2F Valid Range: 0x01-0x0F, 0x20-0x2F
Default Value: 0x2F Default Value: 0x2F
This parameter is a bit mask that specifies which speed and duplex
settings the board advertises. When this parameter is used, the Speed and This parameter is a bit mask that specifies which speed and duplex
Duplex parameters must not be specified. settings the board advertises. When this parameter is used, the Speed
NOTE: Refer to the Speed and Duplex section of this readme for more and Duplex parameters must not be specified.
NOTE: Refer to the Speed and Duplex section of this readme for more
information on the AutoNeg parameter. information on the AutoNeg parameter.
Duplex (adapters using copper connections only)
Duplex
------
(Supported only on adapters with copper connections)
Valid Range: 0-2 (0=auto-negotiate, 1=half, 2=full) Valid Range: 0-2 (0=auto-negotiate, 1=half, 2=full)
Default Value: 0 Default Value: 0
Defines the direction in which data is allowed to flow. Can be either one
or two-directional. If both Duplex and the link partner are set to auto- Defines the direction in which data is allowed to flow. Can be either
negotiate, the board auto-detects the correct duplex. If the link partner one or two-directional. If both Duplex and the link partner are set to
is forced (either full or half), Duplex defaults to half-duplex. auto-negotiate, the board auto-detects the correct duplex. If the link
partner is forced (either full or half), Duplex defaults to half-duplex.
FlowControl FlowControl
----------
Valid Range: 0-3 (0=none, 1=Rx only, 2=Tx only, 3=Rx&Tx) Valid Range: 0-3 (0=none, 1=Rx only, 2=Tx only, 3=Rx&Tx)
Default: Read flow control settings from the EEPROM Default Value: Reads flow control settings from the EEPROM
This parameter controls the automatic generation(Tx) and response(Rx) to
Ethernet PAUSE frames. This parameter controls the automatic generation(Tx) and response(Rx)
to Ethernet PAUSE frames.
InterruptThrottleRate InterruptThrottleRate
---------------------
(not supported on Intel 82542, 82543 or 82544-based adapters)
Valid Range: 100-100000 (0=off, 1=dynamic) Valid Range: 100-100000 (0=off, 1=dynamic)
Default Value: 8000 Default Value: 8000
This value represents the maximum number of interrupts per second the
controller generates. InterruptThrottleRate is another setting used in This value represents the maximum number of interrupts per second the
interrupt moderation. Dynamic mode uses a heuristic algorithm to adjust controller generates. InterruptThrottleRate is another setting used in
InterruptThrottleRate based on the current traffic load. interrupt moderation. Dynamic mode uses a heuristic algorithm to adjust
Un-supported Adapters: InterruptThrottleRate is NOT supported by 82542, 82543 InterruptThrottleRate based on the current traffic load.
or 82544-based adapters.
NOTE: InterruptThrottleRate takes precedence over the TxAbsIntDelay and
NOTE: InterruptThrottleRate takes precedence over the TxAbsIntDelay and
RxAbsIntDelay parameters. In other words, minimizing the receive RxAbsIntDelay parameters. In other words, minimizing the receive
and/or transmit absolute delays does not force the controller to and/or transmit absolute delays does not force the controller to
generate more interrupts than what the Interrupt Throttle Rate generate more interrupts than what the Interrupt Throttle Rate
allows. allows.
CAUTION: If you are using the Intel PRO/1000 CT Network Connection
CAUTION: If you are using the Intel PRO/1000 CT Network Connection
(controller 82547), setting InterruptThrottleRate to a value (controller 82547), setting InterruptThrottleRate to a value
greater than 75,000, may hang (stop transmitting) adapters under greater than 75,000, may hang (stop transmitting) adapters
certain network conditions. If this occurs a NETDEV WATCHDOG under certain network conditions. If this occurs a NETDEV
message is logged in the system event log. In addition, the WATCHDOG message is logged in the system event log. In
controller is automatically reset, restoring the network addition, the controller is automatically reset, restoring
connection. To eliminate the potential for the hang, ensure the network connection. To eliminate the potential for the
that InterruptThrottleRate is set no greater than 75,000 and is hang, ensure that InterruptThrottleRate is set no greater
not set to 0. than 75,000 and is not set to 0.
NOTE: When e1000 is loaded with default settings and multiple adapters are
in use simultaneously, the CPU utilization may increase non-linearly. NOTE: When e1000 is loaded with default settings and multiple adapters
In order to limit the CPU utilization without impacting the overall are in use simultaneously, the CPU utilization may increase non-
throughput, we recommend that you load the driver as follows: linearly. In order to limit the CPU utilization without impacting
the overall throughput, we recommend that you load the driver as
follows:
insmod e1000.o InterruptThrottleRate=3000,3000,3000 insmod e1000.o InterruptThrottleRate=3000,3000,3000
This sets the InterruptThrottleRate to 3000 interrupts/sec for the This sets the InterruptThrottleRate to 3000 interrupts/sec for
first, second, and third instances of the driver. The range of 2000 to the first, second, and third instances of the driver. The range
3000 interrupts per second works on a majority of systems and is a of 2000 to 3000 interrupts per second works on a majority of
good starting point, but the optimal value will be platform-specific. systems and is a good starting point, but the optimal value will
If CPU utilization is not a concern, use RX_POLLING (NAPI) and default be platform-specific. If CPU utilization is not a concern, use
driver settings. RX_POLLING (NAPI) and default driver settings.
RxDescriptors RxDescriptors
-------------
Valid Range: 80-256 for 82542 and 82543-based adapters Valid Range: 80-256 for 82542 and 82543-based adapters
80-4096 for all other supported adapters 80-4096 for all other supported adapters
Default Value: 256 Default Value: 256
This value is the number of receive descriptors allocated by the driver.
Increasing this value allows the driver to buffer more incoming packets. This value specifies the number of receive descriptors allocated by the
Each descriptor is 16 bytes. A receive buffer is allocated for each driver. Increasing this value allows the driver to buffer more incoming
descriptor and can either be 2048 or 4096 bytes long, depending on the MTU packets. Each descriptor is 16 bytes. A receive buffer is also
allocated for each descriptor and is 2048.
setting. An incoming packet can span one or more receive descriptors.
The maximum MTU size is 16110.
NOTE: MTU designates the frame size. It only needs to be set for Jumbo
Frames.
NOTE: Depending on the available system resources, the request for a
higher number of receive descriptors may be denied. In this case,
use a lower number.
RxIntDelay RxIntDelay
----------
Valid Range: 0-65535 (0=off) Valid Range: 0-65535 (0=off)
Default Value: 0 Default Value: 0
This value delays the generation of receive interrupts in units of 1.024
microseconds. Receive interrupt reduction can improve CPU efficiency if This value delays the generation of receive interrupts in units of 1.024
properly tuned for specific network traffic. Increasing this value adds microseconds. Receive interrupt reduction can improve CPU efficiency if
extra latency to frame reception and can end up decreasing the throughput properly tuned for specific network traffic. Increasing this value adds
of TCP traffic. If the system is reporting dropped receives, this value extra latency to frame reception and can end up decreasing the throughput
may be set too high, causing the driver to run out of available receive of TCP traffic. If the system is reporting dropped receives, this value
descriptors. may be set too high, causing the driver to run out of available receive
descriptors.
CAUTION: When setting RxIntDelay to a value other than 0, adapters may
CAUTION: When setting RxIntDelay to a value other than 0, adapters may
hang (stop transmitting) under certain network conditions. If hang (stop transmitting) under certain network conditions. If
this occurs a NETDEV WATCHDOG message is logged in the system this occurs a NETDEV WATCHDOG message is logged in the system
event log. In addition, the controller is automatically reset, event log. In addition, the controller is automatically reset,
restoring the network connection. To eliminate the potential for restoring the network connection. To eliminate the potential
the hang ensure that RxIntDelay is set to 0. for the hang ensure that RxIntDelay is set to 0.
RxAbsIntDelay (82540, 82545 and later adapters only) RxAbsIntDelay
-------------
(This parameter is supported only on 82540, 82545 and later adapters.)
Valid Range: 0-65535 (0=off) Valid Range: 0-65535 (0=off)
Default Value: 128 Default Value: 128
This value, in units of 1.024 microseconds, limits the delay in which a
receive interrupt is generated. Useful only if RxIntDelay is non-zero, This value, in units of 1.024 microseconds, limits the delay in which a
this value ensures that an interrupt is generated after the initial receive interrupt is generated. Useful only if RxIntDelay is non-zero,
packet is received within the set amount of time. Proper tuning, this value ensures that an interrupt is generated after the initial
along with RxIntDelay, may improve traffic throughput in specific network packet is received within the set amount of time. Proper tuning,
conditions. along with RxIntDelay, may improve traffic throughput in specific network
conditions.
Speed (adapters using copper connections only)
Speed
-----
(This parameter is supported only on adapters with copper connections.)
Valid Settings: 0, 10, 100, 1000 Valid Settings: 0, 10, 100, 1000
Default Value: 0 (auto-negotiate at all supported speeds) Default Value: 0 (auto-negotiate at all supported speeds)
Speed forces the line speed to the specified value in megabits per second
(Mbps). If this parameter is not specified or is set to 0 and the link Speed forces the line speed to the specified value in megabits per second
partner is set to auto-negotiate, the board will auto-detect the correct (Mbps). If this parameter is not specified or is set to 0 and the link
speed. Duplex should also be set when Speed is set to either 10 or 100. partner is set to auto-negotiate, the board will auto-detect the correct
speed. Duplex should also be set when Speed is set to either 10 or 100.
TxDescriptors TxDescriptors
-------------
Valid Range: 80-256 for 82542 and 82543-based adapters Valid Range: 80-256 for 82542 and 82543-based adapters
80-4096 for all other supported adapters 80-4096 for all other supported adapters
Default Value: 256 Default Value: 256
This value is the number of transmit descriptors allocated by the driver.
Increasing this value allows the driver to queue more transmits. Each
descriptor is 16 bytes.
NOTE: Depending on the available system resources, the request for a This value is the number of transmit descriptors allocated by the driver.
Increasing this value allows the driver to queue more transmits. Each
descriptor is 16 bytes.
NOTE: Depending on the available system resources, the request for a
higher number of transmit descriptors may be denied. In this case, higher number of transmit descriptors may be denied. In this case,
use a lower number. use a lower number.
TxIntDelay TxIntDelay
----------
Valid Range: 0-65535 (0=off) Valid Range: 0-65535 (0=off)
Default Value: 64 Default Value: 64
This value delays the generation of transmit interrupts in units of
1.024 microseconds. Transmit interrupt reduction can improve CPU
efficiency if properly tuned for specific network traffic. If the
system is reporting dropped transmits, this value may be set too high
causing the driver to run out of available transmit descriptors.
TxAbsIntDelay (82540, 82545 and later adapters only) This value delays the generation of transmit interrupts in units of
1.024 microseconds. Transmit interrupt reduction can improve CPU
efficiency if properly tuned for specific network traffic. If the
system is reporting dropped transmits, this value may be set too high
causing the driver to run out of available transmit descriptors.
TxAbsIntDelay
-------------
(This parameter is supported only on 82540, 82545 and later adapters.)
Valid Range: 0-65535 (0=off) Valid Range: 0-65535 (0=off)
Default Value: 64 Default Value: 64
This value, in units of 1.024 microseconds, limits the delay in which a
transmit interrupt is generated. Useful only if TxIntDelay is non-zero, This value, in units of 1.024 microseconds, limits the delay in which a
this value ensures that an interrupt is generated after the initial transmit interrupt is generated. Useful only if TxIntDelay is non-zero,
packet is sent on the wire within the set amount of time. Proper tuning, this value ensures that an interrupt is generated after the initial
along with TxIntDelay, may improve traffic throughput in specific packet is sent on the wire within the set amount of time. Proper tuning,
network conditions. along with TxIntDelay, may improve traffic throughput in specific
network conditions.
XsumRX (not available on the 82542-based adapter)
XsumRX
------
(This parameter is NOT supported on the 82542-based adapter.)
Valid Range: 0-1 Valid Range: 0-1
Default Value: 1 Default Value: 1
A value of '1' indicates that the driver should enable IP checksum
offload for received packets (both UDP and TCP) to the adapter hardware. A value of '1' indicates that the driver should enable IP checksum
offload for received packets (both UDP and TCP) to the adapter hardware.
Speed and Duplex Configuration Speed and Duplex Configuration
============================== ==============================
Three keywords are used to control the speed and duplex configuration. These Three keywords are used to control the speed and duplex configuration.
keywords are Speed, Duplex, and AutoNeg. These keywords are Speed, Duplex, and AutoNeg.
If the board uses a fiber interface, these keywords are ignored, and the If the board uses a fiber interface, these keywords are ignored, and the
fiber interface board only links at 1000 Mbps full-duplex. fiber interface board only links at 1000 Mbps full-duplex.
For copper-based boards, the keywords interact as follows: For copper-based boards, the keywords interact as follows:
The default operation is auto-negotiate. The board advertises all supported The default operation is auto-negotiate. The board advertises all
speed and duplex combinations, and it links at the highest common speed and supported speed and duplex combinations, and it links at the highest
duplex mode IF the link partner is set to auto-negotiate. common speed and duplex mode IF the link partner is set to auto-negotiate.
If Speed = 1000, limited auto-negotiation is enabled and only 1000 Mbps is If Speed = 1000, limited auto-negotiation is enabled and only 1000 Mbps
advertised (The 1000BaseT spec requires auto-negotiation.) is advertised (The 1000BaseT spec requires auto-negotiation.)
If Speed = 10 or 100, then both Speed and Duplex should be set. Auto- If Speed = 10 or 100, then both Speed and Duplex should be set. Auto-
negotiation is disabled, and the AutoNeg parameter is ignored. Partner SHOULD negotiation is disabled, and the AutoNeg parameter is ignored. Partner
also be forced. SHOULD also be forced.
The AutoNeg parameter is used when more control is required over the auto- The AutoNeg parameter is used when more control is required over the
negotiation process. When this parameter is used, Speed and Duplex parameters auto-negotiation process. It should be used when you wish to control which
must not be specified. The following table describes supported values for the speed and duplex combinations are advertised during the auto-negotiation
AutoNeg parameter: process.
Speed (Mbps) 1000 100 100 10 10 The parameter may be specified as either a decimal or hexidecimal value as
determined by the bitmap below.
Bit position 7 6 5 4 3 2 1 0
Decimal Value 128 64 32 16 8 4 2 1
Hex value 80 40 20 10 8 4 2 1
Speed (Mbps) N/A N/A 1000 N/A 100 100 10 10
Duplex Full Full Half Full Half Duplex Full Full Half Full Half
Value (in base 16) 0x20 0x08 0x04 0x02 0x01
Example: insmod e1000 AutoNeg=0x03, loads e1000 and specifies (10 full duplex, Some examples of using AutoNeg:
10 half duplex) for negotiation with the peer.
modprobe e1000 AutoNeg=0x01 (Restricts autonegotiation to 10 Half)
modprobe e1000 AutoNeg=1 (Same as above)
modprobe e1000 AutoNeg=0x02 (Restricts autonegotiation to 10 Full)
modprobe e1000 AutoNeg=0x03 (Restricts autonegotiation to 10 Half or 10 Full)
modprobe e1000 AutoNeg=0x04 (Restricts autonegotiation to 100 Half)
modprobe e1000 AutoNeg=0x05 (Restricts autonegotiation to 10 Half or 100
Half)
modprobe e1000 AutoNeg=0x020 (Restricts autonegotiation to 1000 Full)
modprobe e1000 AutoNeg=32 (Same as above)
Note that when this parameter is used, Speed and Duplex must not be specified.
Note that setting AutoNeg does not guarantee that the board will link at the If the link partner is forced to a specific speed and duplex, then this
highest specified speed or duplex mode, but the board will link at the parameter should not be used. Instead, use the Speed and Duplex parameters
highest possible speed/duplex of the link partner IF the link partner is also previously mentioned to force the adapter to the same speed and duplex.
set to auto-negotiate. If the link partner is forced speed/duplex, the
adapter MUST be forced to the same speed/duplex.
Additional Configurations Additional Configurations
...@@ -276,19 +338,19 @@ Additional Configurations ...@@ -276,19 +338,19 @@ Additional Configurations
Configuring the Driver on Different Distributions Configuring the Driver on Different Distributions
------------------------------------------------- -------------------------------------------------
Configuring a network driver to load properly when the system is started is Configuring a network driver to load properly when the system is started
distribution dependent. Typically, the configuration process involves adding is distribution dependent. Typically, the configuration process involves
an alias line to /etc/modules.conf as well as editing other system startup adding an alias line to /etc/modules.conf or /etc/modprobe.conf as well
scripts and/or configuration files. Many popular Linux distributions ship as editing other system startup scripts and/or configuration files. Many
with tools to make these changes for you. To learn the proper way to popular Linux distributions ship with tools to make these changes for you.
configure a network device for your system, refer to your distribution To learn the proper way to configure a network device for your system,
documentation. If during this process you are asked for the driver or module refer to your distribution documentation. If during this process you are
name, the name for the Linux Base Driver for the Intel PRO/1000 Family of asked for the driver or module name, the name for the Linux Base Driver
Adapters is e1000. for the Intel PRO/1000 Family of Adapters is e1000.
As an example, if you install the e1000 driver for two PRO/1000 adapters As an example, if you install the e1000 driver for two PRO/1000 adapters
(eth0 and eth1) and set the speed and duplex to 10full and 100half, add the (eth0 and eth1) and set the speed and duplex to 10full and 100half, add
following to modules.conf: the following to modules.conf or or modprobe.conf:
alias eth0 e1000 alias eth0 e1000
alias eth1 e1000 alias eth1 e1000
...@@ -298,8 +360,8 @@ Additional Configurations ...@@ -298,8 +360,8 @@ Additional Configurations
--------------------- ---------------------
Link messages will not be displayed to the console if the distribution is Link messages will not be displayed to the console if the distribution is
restricting system messages. In order to see network driver link messages on restricting system messages. In order to see network driver link messages
your console, set dmesg to eight by entering the following: on your console, set dmesg to eight by entering the following:
dmesg -n 8 dmesg -n 8
...@@ -308,22 +370,42 @@ Additional Configurations ...@@ -308,22 +370,42 @@ Additional Configurations
Jumbo Frames Jumbo Frames
------------ ------------
The driver supports Jumbo Frames for all adapters except 82542-based The driver supports Jumbo Frames for all adapters except 82542 and
adapters. Jumbo Frames support is enabled by changing the MTU to a value 82573-based adapters. Jumbo Frames support is enabled by changing the
larger than the default of 1500. Use the ifconfig command to increase the MTU to a value larger than the default of 1500. Use the ifconfig command
MTU size. For example: to increase the MTU size. For example:
ifconfig ethx mtu 9000 up ifconfig eth<x> mtu 9000 up
The maximum MTU setting for Jumbo Frames is 16110. This value coincides This setting is not saved across reboots. It can be made permanent if
with the maximum Jumbo Frames size of 16128. you add:
NOTE: Jumbo Frames are supported at 1000 Mbps only. Using Jumbo Frames at MTU=9000
10 or 100 Mbps may result in poor performance or loss of link.
to the file /etc/sysconfig/network-scripts/ifcfg-eth<x>. This example
applies to the Red Hat distributions; other distributions may store this
setting in a different location.
Notes:
- To enable Jumbo Frames, increase the MTU size on the interface beyond
1500.
- The maximum MTU setting for Jumbo Frames is 16110. This value coincides
with the maximum Jumbo Frames size of 16128.
- Using Jumbo Frames at 10 or 100 Mbps may result in poor performance or
loss of link.
- Some Intel gigabit adapters that support Jumbo Frames have a frame size
limit of 9238 bytes, with a corresponding MTU size limit of 9216 bytes.
The adapters with this limitation are based on the Intel 82571EB and
82572EI controllers, which correspond to these product names:
Intel® PRO/1000 PT Dual Port Server Adapter
Intel® PRO/1000 PF Dual Port Server Adapter
Intel® PRO/1000 PT Server Adapter
Intel® PRO/1000 PT Desktop Adapter
Intel® PRO/1000 PF Server Adapter
- The Intel PRO/1000 PM Network Connection does not support jumbo frames.
NOTE: MTU designates the frame size. To enable Jumbo Frames, increase the
MTU size on the interface beyond 1500.
Ethtool Ethtool
------- -------
...@@ -333,7 +415,7 @@ Additional Configurations ...@@ -333,7 +415,7 @@ Additional Configurations
version 1.6 or later is required for this functionality. version 1.6 or later is required for this functionality.
The latest release of ethtool can be found from The latest release of ethtool can be found from
http://sf.net/projects/gkernel. http://sourceforge.net/projects/gkernel.
NOTE: Ethtool 1.6 only supports a limited set of ethtool options. Support NOTE: Ethtool 1.6 only supports a limited set of ethtool options. Support
for a more complete ethtool feature set can be enabled by upgrading for a more complete ethtool feature set can be enabled by upgrading
...@@ -358,7 +440,16 @@ Additional Configurations ...@@ -358,7 +440,16 @@ Additional Configurations
---- ----
NAPI (Rx polling mode) is supported in the e1000 driver. NAPI is enabled NAPI (Rx polling mode) is supported in the e1000 driver. NAPI is enabled
or disabled based on the configuration of the kernel. or disabled based on the configuration of the kernel. To override
the default, use the following compile-time flags.
To enable NAPI, compile the driver module, passing in a configuration option:
make CFLAGS_EXTRA=-DE1000_NAPI install
To disable NAPI, compile the driver module, passing in a configuration option:
make CFLAGS_EXTRA=-DE1000_NO_NAPI install
See www.cyberus.ca/~hadi/usenix-paper.tgz for more information on NAPI. See www.cyberus.ca/~hadi/usenix-paper.tgz for more information on NAPI.
...@@ -370,9 +461,84 @@ Known Issues ...@@ -370,9 +461,84 @@ Known Issues
------------------------------- -------------------------------
Memory allocation failures have been observed on Linux systems with 64 MB Memory allocation failures have been observed on Linux systems with 64 MB
of RAM or less that are running Jumbo Frames. If you are using Jumbo Frames, of RAM or less that are running Jumbo Frames. If you are using Jumbo
your system may require more than the advertised minimum requirement of 64 MB Frames, your system may require more than the advertised minimum
of system memory. requirement of 64 MB of system memory.
Performance Degradation with Jumbo Frames
-----------------------------------------
Degradation in throughput performance may be observed in some Jumbo frames
environments. If this is observed, increasing the application's socket
buffer size and/or increasing the /proc/sys/net/ipv4/tcp_*mem entry values
may help. See the specific application manual and
/usr/src/linux*/Documentation/
networking/ip-sysctl.txt for more details.
Jumbo frames on Foundry BigIron 8000 switch
-------------------------------------------
There is a known issue using Jumbo frames when connected to a Foundry
BigIron 8000 switch. This is a 3rd party limitation. If you experience
loss of packets, lower the MTU size.
Multiple Interfaces on Same Ethernet Broadcast Network
------------------------------------------------------
Due to the default ARP behavior on Linux, it is not possible to have
one system on two IP networks in the same Ethernet broadcast domain
(non-partitioned switch) behave as expected. All Ethernet interfaces
will respond to IP traffic for any IP address assigned to the system.
This results in unbalanced receive traffic.
If you have multiple interfaces in a server, either turn on ARP
filtering by entering:
echo 1 > /proc/sys/net/ipv4/conf/all/arp_filter
(this only works if your kernel's version is higher than 2.4.5),
NOTE: This setting is not saved across reboots. The configuration
change can be made permanent by adding the line:
net.ipv4.conf.all.arp_filter = 1
to the file /etc/sysctl.conf
or,
install the interfaces in separate broadcast domains (either in
different switches or in a switch partitioned to VLANs).
82541/82547 can't link or are slow to link with some link partners
-----------------------------------------------------------------
There is a known compatibility issue with 82541/82547 and some
low-end switches where the link will not be established, or will
be slow to establish. In particular, these switches are known to
be incompatible with 82541/82547:
Planex FXG-08TE
I-O Data ETG-SH8
To workaround this issue, the driver can be compiled with an override
of the PHY's master/slave setting. Forcing master or forcing slave
mode will improve time-to-link.
# make EXTRA_CFLAGS=-DE1000_MASTER_SLAVE=<n>
Where <n> is:
0 = Hardware default
1 = Master mode
2 = Slave mode
3 = Auto master/slave
Disable rx flow control with ethtool
------------------------------------
In order to disable receive flow control using ethtool, you must turn
off auto-negotiation on the same command line.
For example:
ethtool -A eth? autoneg off rx off
Support Support
...@@ -382,9 +548,13 @@ For general information, go to the Intel support website at: ...@@ -382,9 +548,13 @@ For general information, go to the Intel support website at:
http://support.intel.com http://support.intel.com
or the Intel Wired Networking project hosted by Sourceforge at:
http://sourceforge.net/projects/e1000
If an issue is identified with the released source code on the supported If an issue is identified with the released source code on the supported
kernel with a supported adapter, email the specific information related to kernel with a supported adapter, email the specific information related
the issue to linux.nics@intel.com. to the issue to e1000-devel@lists.sourceforge.net
License License
...@@ -393,7 +563,7 @@ License ...@@ -393,7 +563,7 @@ License
This software program is released under the terms of a license agreement This software program is released under the terms of a license agreement
between you ('Licensee') and Intel. Do not use or load this software or any between you ('Licensee') and Intel. Do not use or load this software or any
associated materials (collectively, the 'Software') until you have carefully associated materials (collectively, the 'Software') until you have carefully
read the full terms and conditions of the LICENSE located in this software read the full terms and conditions of the file COPYING located in this software
package. By loading or using the Software, you agree to the terms of this package. By loading or using the Software, you agree to the terms of this
Agreement. If you do not agree with the terms of this Agreement, do not Agreement. If you do not agree with the terms of this Agreement, do not
install or use the Software. install or use the Software.
......
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