netdev - Re: Netperf TCP_RR(loopback) 10% regression in 2.6.24-rc6, comparing with 2.6.22

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Message-ID: <4787ADDA.7090602@hp.com>
Date:	Fri, 11 Jan 2008 09:56:42 -0800
From:	Rick Jones <rick.jones2@...com>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
CC:	LKML <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org
Subject: Re: Netperf TCP_RR(loopback) 10% regression in 2.6.24-rc6,	comparing
 with 2.6.22

>>The test command is:
>>#sudo taskset -c 7 ./netserver
>>#sudo taskset -c 0 ./netperf -t TCP_RR -l 60 -H 127.0.0.1 -i 50,3 -I 99,5 -- -r 1,1

A couple of comments/questions on the command lines:

*) netperf/netserver support CPU affinity within themselves with the 
global -T option to netperf.  Is the result with taskset much different? 
   The equivalent to the above would be to run netperf with:

./netperf -T 0,7 ...

The one possibly salient difference between the two is that when done 
within netperf, the initial process creation will take place wherever 
the scheduler wants it.

*) The -i option to set the confidence iteration count will silently cap 
the max at 30.

happy benchmarking,

rick jones
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