#This patch was developed both in-house and from outside. We plan to submit it

#upstream, but do not yet have a target date for doing so

#

# HG changeset patch

# Parent  bed9e1f4976b9258363d26ec587075f77ac65042

22689609 qperf returns failed to receive results: timed out for ud_bw tests

diff -r bed9e1f4976b src/rdma.c

--- a/src/rdma.c	Thu Feb 11 05:13:36 2016 -0800

+++ b/src/rdma.c	Tue Feb 23 21:03:12 2016 -0800

@@ -987,9 +987,14 @@

 {

     DEVICE dev;

-    rd_open(&dev, transport, 0, NCQE);

+    /*

+     * Post more receive buffers for the server, A fast client can cause receive WR

+     * exhaustion, which in turn can cause packet drop (in case of UD) or cause

+     * re-transmits (in case of RC).

+     */   

+    rd_open(&dev, transport, 0, (4 * NCQE));

     rd_prep(&dev, 0);

-    rd_post_recv_std(&dev, NCQE);

+    rd_post_recv_std(&dev, (4 * NCQE));

     sync_test();

     while (!Finished) {

         int i;

@@ -2574,6 +2579,14 @@

 {

     int n;

+    /*

+     * We will attempt to poll the CQ first.

+     * If CQ is empty we could wait for CQ notification.

+     */

+    n = ibv_poll_cq(dev->cq, nwc, wc);

+    if (n > 0)

+    	return n;

+

     if (!Req.poll_mode && !Finished) {

         void *ectx;

         struct ibv_cq *ecq;