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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>
This commit is contained in:
Hoang-Nam Nguyen 2007-07-09 15:33:52 +02:00 committed by Roland Dreier
parent 8705ce5b90
commit f72d2f0814
1 changed files with 2 additions and 3 deletions
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5
drivers/infiniband/hw/ehca/ehca_reqs.c
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@ -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;
}