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    • Andrew Morton's avatar
      fix spellos · a4ea534f
      Andrew Morton authored 
      Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Len Brown <lenb@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: Yanmin Zhang <yanmin_zhang@linux.intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      a4ea534f
    • Arjan van de Ven's avatar
      Add a new idle governor which balances power savings, energy efficiency · 6649a41f
      Arjan van de Ven authored 
      and performance impact.

The reason for a reworked governor is that there have been serious
performance issues reported with the existing code on Nehalem server
systems.

To show this I'm sure Andrew wants to see benchmark results:
(benchmark is "fio", "no cstates" is using "idle=poll")

		no cstates	current linux	new algorithm
1 disk		107 Mb/s	85 Mb/s		105 Mb/s
2 disks		215 Mb/s	123 Mb/s	209 Mb/s
12 disks	590 Mb/s	320 Mb/s	585 Mb/s

In various power benchmark measurements, no degredation was found by our
measurement&diagnostics team.  Obviously a bit more power was used in the
"fio" benchmark, due to the much higher performance.

The integration plan for this is to first add the new governor, but for
one kernel generation, leave the old menu governor in place so that it's
possible to separate out behavior from this governor versus other things
in diagnostics.  If no issues are found, I'll remove the old governor in
the kernel cycle after that.

While it would be a novel idea to describe the new algorithm in this
commit message, I cheaped out and described it in comments in the code
instead.
Signed-off-by: default avatarArjan van de Ven <arjan@linux.intel.com>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: Len Brown <lenb@kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Yanmin Zhang <yanmin_zhang@linux.intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      6649a41f
  49. 10 Sep, 2009 2 commits
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  53. 02 Sep, 2009 1 commit
  55. 14 Aug, 2009 2 commits
  57. 07 Aug, 2009 1 commit
  59. 23 Jun, 2009 1 commit
    • Andrew Morton's avatar
      Presently acpi-cpufreq will perform the MSR read on the first CPU in the · 4e454576
      Andrew Morton authored 
      mask.  That's inefficient if that CPU differs from the current CPU. 
Because we have to perform a cross-CPU call, but we could have run the
rdmsr on the current CPU.

So switch to using the new smp_call_function_any(), whcih will perform the
call on the current CPU if that CPU is present in the mask (it is).

Cc: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
Cc: Dave Jones <davej@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Jaswinder Singh Rajput <jaswinder@kernel.org>
Cc: Len Brown <len.brown@intel.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      4e454576
  61. 07 Aug, 2009 1 commit
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