From: Chuck Lever <chuck.lever-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org> To: linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: Anna.Schumaker-HgOvQuBEEgTQT0dZR+AlfA@public.gmane.org Subject: [PATCH V3 12/17] xprtrmda: Reduce lock contention in completion handlers Date: Wed, 30 Apr 2014 15:31:13 -0400 [thread overview] Message-ID: <20140430193113.5663.89235.stgit@manet.1015granger.net> (raw) In-Reply-To: <20140430191433.5663.16217.stgit-FYjufvaPoItvLzlybtyyYzGyq/o6K9yX@public.gmane.org> 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-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org> --- net/sunrpc/xprtrdma/verbs.c | 14 ++++++++++---- 1 files changed, 10 insertions(+), 4 deletions(-) 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; -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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From: Chuck Lever <chuck.lever@oracle.com> To: linux-nfs@vger.kernel.org, linux-rdma@vger.kernel.org Cc: Anna.Schumaker@netapp.com Subject: [PATCH V3 12/17] xprtrmda: Reduce lock contention in completion handlers Date: Wed, 30 Apr 2014 15:31:13 -0400 [thread overview] Message-ID: <20140430193113.5663.89235.stgit@manet.1015granger.net> (raw) In-Reply-To: <20140430191433.5663.16217.stgit@manet.1015granger.net> 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(-) 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;
next prev parent reply other threads:[~2014-04-30 19:31 UTC|newest] Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-04-30 19:29 [PATCH V3 00/17] NFS/RDMA client-side patches Chuck Lever 2014-04-30 19:29 ` Chuck Lever [not found] ` <20140430191433.5663.16217.stgit-FYjufvaPoItvLzlybtyyYzGyq/o6K9yX@public.gmane.org> 2014-04-30 19:29 ` [PATCH V3 01/17] xprtrdma: mind the device's max fast register page list depth Chuck Lever 2014-04-30 19:29 ` Chuck Lever [not found] ` <20140430192936.5663.66537.stgit-FYjufvaPoItvLzlybtyyYzGyq/o6K9yX@public.gmane.org> 2014-05-16 7:08 ` Devesh Sharma 2014-05-16 7:08 ` Devesh Sharma [not found] ` <EE7902D3F51F404C82415C4803930ACD3FDFBDA9-DWYeeINJQrxExQ8dmkPuX0M9+F4ksjoh@public.gmane.org> 2014-05-16 14:10 ` Steve Wise 2014-05-16 14:10 ` Steve Wise [not found] ` <53761C63.4050908-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org> 2014-05-16 14:14 ` Steve Wise 2014-05-16 14:14 ` Steve Wise [not found] ` <53761D28.3070704-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org> 2014-05-16 14:29 ` Steve Wise 2014-05-16 14:29 ` Steve Wise [not found] ` <537620AF.3010307-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org> 2014-05-17 8:23 ` Devesh Sharma 2014-05-17 8:23 ` Devesh Sharma 2014-04-30 19:29 ` [PATCH V3 02/17] nfs-rdma: Fix for FMR leaks Chuck Lever 2014-04-30 19:29 ` Chuck Lever 2014-04-30 19:29 ` [PATCH V3 03/17] xprtrdma: RPC/RDMA must invoke xprt_wake_pending_tasks() in process context Chuck Lever 2014-04-30 19:29 ` Chuck Lever 2014-04-30 19:30 ` [PATCH V3 04/17] xprtrdma: Remove BOUNCEBUFFERS memory registration mode Chuck Lever 2014-04-30 19:30 ` Chuck Lever 2014-04-30 19:30 ` [PATCH V3 05/17] xprtrdma: Remove MEMWINDOWS registration modes Chuck Lever 2014-04-30 19:30 ` Chuck Lever 2014-04-30 19:30 ` [PATCH V3 06/17] xprtrdma: Remove REGISTER memory registration mode Chuck Lever 2014-04-30 19:30 ` Chuck Lever 2014-04-30 19:30 ` [PATCH V3 07/17] xprtrdma: Fall back to MTHCAFMR when FRMR is not supported Chuck Lever 2014-04-30 19:30 ` Chuck Lever 2014-04-30 19:30 ` [PATCH V3 08/17] xprtrdma: mount reports "Invalid mount option" if memreg mode " Chuck Lever 2014-04-30 19:30 ` Chuck Lever 2014-04-30 19:30 ` [PATCH V3 09/17] xprtrdma: Simplify rpcrdma_deregister_external() synopsis Chuck Lever 2014-04-30 19:30 ` Chuck Lever 2014-04-30 19:30 ` [PATCH V3 10/17] xprtrdma: Make rpcrdma_ep_destroy() return void Chuck Lever 2014-04-30 19:30 ` Chuck Lever 2014-04-30 19:31 ` [PATCH V3 11/17] xprtrdma: Split the completion queue Chuck Lever 2014-04-30 19:31 ` Chuck Lever 2014-04-30 19:31 ` Chuck Lever [this message] 2014-04-30 19:31 ` [PATCH V3 12/17] xprtrmda: Reduce lock contention in completion handlers Chuck Lever 2014-04-30 19:31 ` [PATCH V3 13/17] xprtrmda: Reduce calls to ib_poll_cq() " Chuck Lever 2014-04-30 19:31 ` Chuck Lever 2014-04-30 19:31 ` [PATCH V3 14/17] xprtrdma: Limit work done by completion handler Chuck Lever 2014-04-30 19:31 ` Chuck Lever 2014-04-30 19:31 ` [PATCH V3 15/17] xprtrdma: Reduce the number of hardway buffer allocations Chuck Lever 2014-04-30 19:31 ` Chuck Lever 2014-04-30 19:31 ` [PATCH V3 16/17] xprtrdma: Ensure ia->ri_id->qp is not NULL when reconnecting Chuck Lever 2014-04-30 19:31 ` Chuck Lever 2014-04-30 19:31 ` [PATCH V3 17/17] xprtrdma: Remove Tavor MTU setting Chuck Lever 2014-04-30 19:31 ` Chuck Lever [not found] ` <20140430193155.5663.86148.stgit-FYjufvaPoItvLzlybtyyYzGyq/o6K9yX@public.gmane.org> 2014-05-01 7:36 ` Hal Rosenstock 2014-05-01 7:36 ` Hal Rosenstock 2014-05-02 19:27 ` [PATCH V3 00/17] NFS/RDMA client-side patches Doug Ledford 2014-05-02 19:27 ` Doug Ledford 2014-05-02 19:27 ` Doug Ledford 2014-05-02 19:27 ` Doug Ledford 2014-05-02 19:27 ` Doug Ledford [not found] ` <5363f223.e39f420a.4af6.6fc9SMTPIN_ADDED_BROKEN@mx.google.com> [not found] ` <5363f223.e39f420a.4af6.6fc9SMTPIN_ADDED_BROKEN-ATjtLOhZ0NVl57MIdRCFDg@public.gmane.org> 2014-05-02 20:20 ` Chuck Lever 2014-05-02 20:20 ` Chuck Lever [not found] ` <45067B04-660C-4971-B12F-AEC9F7D32785-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org> 2014-05-02 22:34 ` Doug Ledford 2014-05-02 22:34 ` Doug Ledford 2014-05-02 22:34 ` Doug Ledford 2014-05-02 22:34 ` Doug Ledford 2014-05-02 22:34 ` Doug Ledford
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