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FromJoachim Fenkes <>
Subject[PATCH 13/13] IB/ehca: Improve latency by unlocking the SQ/RQ after triggering the hardware
DateMon, 9 Jul 2007 15:33:52 +0200
From: Hoang-Nam Nguyen <hnguyen@de.ibm.com>

Signed-off-by: Joachim Fenkes <fenkes@de.ibm.com>
---
drivers/infiniband/hw/ehca/ehca_reqs.c | 5 ++---
1 files changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/infiniband/hw/ehca/ehca_reqs.c b/drivers/infiniband/hw/ehca/ehca_reqs.c
index fd3ba22..61da65e 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;
}

--
1.5.2

-
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