#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;