netdev - Re: TCP_STREAM performance regression on commit b3613118

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Message-ID: <4F56563C.2070206@hp.com>
Date:	Tue, 06 Mar 2012 10:23:56 -0800
From:	Rick Jones <rick.jones2@...com>
To:	Feng Tang <feng.tang@...el.com>
CC:	David Miller <davem@...emloft.net>, alex.shi@...el.com,
	eric.dumazet@...il.com, linux-kernel@...r.kernel.org,
	tim.c.chen@...el.com, ying.huang@...el.com, netdev@...r.kernel.org
Subject: Re: TCP_STREAM performance regression on commit b3613118

On 03/06/2012 12:11 AM, Feng Tang wrote:
> On some machines, we found there is about 10% resgression of netperf
> TCP-64K loopback test between 3.2 and 3.3-rc1. The exact test is:
> ./netperf -t TCP_STREAM -l 60 -H 127.0.0.1 -i 50,3 -I 99,5 -- -s 32768 -S 32768 -m 4096

Side comment on the netperf command line.  The maximum confidence 
interactions is silently capped at 30, so that might as well be "-i 
30,3" 
http://www.netperf.org/svn/netperf2/tags/netperf-2.5.0/doc/netperf.html#index-g_t_002di_002c-Global-28

Also, for reproducibility, it might be desirable to pin netperf and 
netserver to a specific CPU or CPUs.  That would be with a global -T 
option: 
http://www.netperf.org/svn/netperf2/tags/netperf-2.5.0/doc/netperf.html#index-g_t_002dT_002c-Global-41

happy benchmarking,

rick jones
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