diff mbox

[v4,12/24] xprtrmda: Reduce lock contention in completion handlers

Message ID 20140522005556.27190.55959.stgit@manet.1015granger.net (mailing list archive)
State Superseded, archived
Headers show

Commit Message

Chuck Lever May 22, 2014, 12:55 a.m. UTC 
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>
---

 net/sunrpc/xprtrdma/verbs.c |   14 ++++++++++----
 1 files changed, 10 insertions(+), 4 deletions(-)


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diff mbox

Patch

diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index af2d097..c7d5281 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -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;