From: Ed Cashin <ecashin@coraid.com>
Date: Tue, 18 Dec 2012 00:03:49 +0000 (-0800)
Subject: aoe: use high-resolution RTTs with fallback to low-res
X-Git-Tag: v3.8-rc1~74^2~41
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5f0c9c48e7265039c3f945aaf44a1c6ae8adbd01;p=pandora-kernel.git

aoe: use high-resolution RTTs with fallback to low-res

These changes improve the accuracy of the decision about whether it's time
to retransmit an AoE command by using the microsecond-resolution
gettimeofday instead of jiffies.

Because the system time can jump suddenly, the decision reverts to using
jiffies if the high-resolution time difference is relatively large.
Otherwise the AoE targets could be considered failed inappropriately.

Signed-off-by: Ed Cashin <ecashin@coraid.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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