From: Hoang-Nam Nguyen Date: Mon, 9 Jul 2007 13:33:52 +0000 (+0200) Subject: IB/ehca: Improve latency by unlocking after triggering the hardware X-Git-Tag: v2.6.23-rc1~1085^2~13 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f72d2f081453d8b1ea36e47478c3463042746ddc;p=linux-2.6 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 Signed-off-by: Roland Dreier --- diff --git a/drivers/infiniband/hw/ehca/ehca_reqs.c b/drivers/infiniband/hw/ehca/ehca_reqs.c index fd3ba22467..61da65e6e5 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; }