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authorHoang-Nam Nguyen <hnguyen@de.ibm.com>2007-07-09 15:33:52 +0200
committerRoland Dreier <rolandd@cisco.com>2007-07-09 20:12:27 -0700
commitf72d2f081453d8b1ea36e47478c3463042746ddc (patch)
treeadd8200b720656a1dc36f165f5e8872e5db30633
parent8705ce5b90118be93eb8b0ed6f49ca5ff377df24 (diff)
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>
-rw-r--r--drivers/infiniband/hw/ehca/ehca_reqs.c5
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 fd3ba22467e8..61da65e6e5e0 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;
}