From: Steve Wise <swise@opengridcomputing.com>
Date: Thu, 9 Apr 2009 14:09:36 +0000 (+0000)
Subject: RDS/IW+IB: Set recv ring low water mark to 1/2 full.
X-Git-Tag: v2.6.31-rc1~330^2~683
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5cd2fe6d54c91aa76893b3034f5f3473063c0202;p=pandora-kernel.git

RDS/IW+IB: Set recv ring low water mark to 1/2 full.

Currently the recv ring low water mark is 1/4 the depth.  Performance
measurements show that this limits iWARP throughput by flow controlling
the rds-stress senders.  Setting it to 1/2 seems to max the T3
performance.  I tried even higher levels but that didn't help and it
started to increase the rds thread cpu utilization.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Andy Grover <andy.grover@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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