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xprtrmda: Reduce lock contention in completion handlers

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Skip the ib_poll_cq() after re-arming, if the provider knows there
are no additional items waiting. (Have a look at commit ed23a727 for
more details).

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2014-05-28 10:33:34 -04:00 committed by Anna Schumaker
parent fc66448549
commit 7f23f6f6e3
1 changed files with 10 additions and 4 deletions
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14
net/sunrpc/xprtrdma/verbs.c
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@ -192,8 +192,11 @@ rpcrdma_sendcq_upcall(struct ib_cq *cq, void *cq_context)
return; return;
} }
rc = ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); rc = ib_req_notify_cq(cq,
if (rc) { IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS);
if (rc == 0)
return;
if (rc < 0) {
dprintk("RPC: %s: ib_req_notify_cq failed: %i\n", dprintk("RPC: %s: ib_req_notify_cq failed: %i\n",
__func__, rc); __func__, rc);
return; return;
@ -272,8 +275,11 @@ rpcrdma_recvcq_upcall(struct ib_cq *cq, void *cq_context)
return; return;
} }
rc = ib_req_notify_cq(cq, IB_CQ_NEXT_COMP); rc = ib_req_notify_cq(cq,
if (rc) { IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS);
if (rc == 0)
return;
if (rc < 0) {
dprintk("RPC: %s: ib_req_notify_cq failed: %i\n", dprintk("RPC: %s: ib_req_notify_cq failed: %i\n",
__func__, rc); __func__, rc);
return; return;