From 0e70b792a716764bcaaa70fb52662f5b97589fc9 Mon Sep 17 00:00:00 2001
From: Sean Hefty <sean.hefty@intel.com>
Date: Mon, 4 Jun 2012 14:51:41 -0700
Subject: [PATCH] rsocket: Spin before blocking on an rsocket

The latency cost of blocking is significant compared to round
trip ping-pong time.  Spin briefly on rsockets before calling
into the kernel and blocking.

The time to spin before blocking is read from an rsocket
configuration file rdma/rsocket/polling_time.  This is user
adjustable or may be set automatically by ibacm.

As a completely unintentional side effect, this just happens to
improve application performance in benchmarks, like netpipe.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
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2.45.2