linux-kernel - TCP stream performance regression due to c377411f2494a931ff7facdbb3a6839b1266bcf6

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Date:	Fri, 18 Jun 2010 15:17:28 +0800
From:	"Alex,Shi" <alex.shi@...el.com>
To:	eric.dumazet@...il.com, davem@...emloft.net
Cc:	"Chen, Tim C" <tim.c.chen@...el.com>,
	"Zhang, Yanmin" <yanmin.zhang@...el.com>,
	linux-kernel@...r.kernel.org
Subject: TCP stream performance regression due to
 c377411f2494a931ff7facdbb3a6839b1266bcf6

In our netperf testing, TCP_STREAM56 shows about 20% or more performance
regression on WSM/NHM and tigerton machines. The testing boot up both
netserver and client on localhost. The testing command like this:
./snapshot_script_net TC_STREAM56 127.0.0.1 

We found the following commit causes this issue.
c377411f2494a931ff7facdbb3a6839b1266bcf6  
Revert this commit will recover this regression on all machine. 

Regards!
Alex 

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