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Commit 7f23f6f6 authored by Chuck Lever's avatar Chuck Lever Committed by Anna Schumaker
Browse files

xprtrmda: Reduce lock contention in completion handlers 



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: default avatarChuck Lever <chuck.lever@oracle.com>
Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
parent fc664485

net/sunrpc/xprtrdma/verbs.c

+10 −4
Original line number Diff line number Diff line
@@ -192,8 +192,11 @@ rpcrdma_sendcq_upcall(struct ib_cq *cq, void *cq_context) 
		return;

	}



	rc = ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);

	if (rc) {

	rc = ib_req_notify_cq(cq,

			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",

			__func__, rc);

		return;
@@ -272,8 +275,11 @@ rpcrdma_recvcq_upcall(struct ib_cq *cq, void *cq_context) 
		return;

	}



	rc = ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);

	if (rc) {

	rc = ib_req_notify_cq(cq,

			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",

			__func__, rc);

		return;