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authorChuck Lever <chuck.lever@oracle.com>2014-05-28 10:33:34 -0400
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2014-06-04 08:56:43 -0400
commit7f23f6f6e388d2003c4ecf5d558f3c2191e12530 (patch)
tree082b8cfb518dd87fe8b0ff6e70f371022c12e180 /net/sunrpc
parentfc66448549bbb77f2f1a38b270ab2d6b6a22da33 (diff)
downloadlinux-next-7f23f6f6e388d2003c4ecf5d558f3c2191e12530.tar.gz
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: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'net/sunrpc')
-rw-r--r--net/sunrpc/xprtrdma/verbs.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index af2d097c221f..c7d5281063fd 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;