From f72d2f081453d8b1ea36e47478c3463042746ddc Mon Sep 17 00:00:00 2001 From: Hoang-Nam Nguyen <hnguyen@de.ibm.com> Date: Mon, 9 Jul 2007 15:33:52 +0200 Subject: [PATCH] IB/ehca: Improve latency by unlocking after triggering the hardware Kick the hardware before unlocking the send/receive queue to overlap processing a little more. Signed-off-by: Joachim Fenkes <fenkes@de.ibm.com> Signed-off-by: Roland Dreier <rolandd@cisco.com> --- drivers/infiniband/hw/ehca/ehca_reqs.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/infiniband/hw/ehca/ehca_reqs.c b/drivers/infiniband/hw/ehca/ehca_reqs.c index fd3ba22467e..61da65e6e5e 100644 --- a/drivers/infiniband/hw/ehca/ehca_reqs.c +++ b/drivers/infiniband/hw/ehca/ehca_reqs.c @@ -407,10 +407,9 @@ int ehca_post_send(struct ib_qp *qp, } /* eof for cur_send_wr */ post_send_exit0: - /* UNLOCK the QUEUE */ - spin_unlock_irqrestore(&my_qp->spinlock_s, flags); iosync(); /* serialize GAL register access */ hipz_update_sqa(my_qp, wqe_cnt); + spin_unlock_irqrestore(&my_qp->spinlock_s, flags); return ret; } @@ -473,9 +472,9 @@ static int internal_post_recv(struct ehca_qp *my_qp, } /* eof for cur_recv_wr */ post_recv_exit0: - spin_unlock_irqrestore(&my_qp->spinlock_r, flags); iosync(); /* serialize GAL register access */ hipz_update_rqa(my_qp, wqe_cnt); + spin_unlock_irqrestore(&my_qp->spinlock_r, flags); return ret; } -- 2.25.4