netdev - Re: [BUG,REGRESSION?] 3.11.6+,3.12: GbE iface rate drops to few KB/s

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Message-ID: <528E95DD.3060209@hp.com>
Date:	Thu, 21 Nov 2013 15:23:09 -0800
From:	Rick Jones <rick.jones2@...com>
To:	Arnaud Ebalard <arno@...isbad.org>,
	Eric Dumazet <eric.dumazet@...il.com>
CC:	Willy Tarreau <w@....eu>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	simon.guinot@...uanux.org, netdev@...r.kernel.org,
	edumazet@...gle.com, Cong Wang <xiyou.wangcong@...il.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [BUG,REGRESSION?] 3.11.6+,3.12: GbE iface rate drops to few KB/s

On 11/21/2013 02:55 PM, Arnaud Ebalard wrote:
> On the RN2120, for a file served from /run/shm (for apache and nginx):
>
>            Apache     nginx       netperf
> 131072:  102 MB/s   112 MB/s   941.11 Mb/s
>   65536:  102 MB/s   112 MB/s   935.97 Mb/s
>   32768:  101 MB/s   105 MB/s   940.49 Mb/s
>   16384:   94 MB/s    90 MB/s   770.07 Mb/s
>    8192:   83 MB/s    66 MB/s   556.79 Mb/s

If you want to make the units common across all three tests, netperf 
accepts a global -f option to alter the output units.  If you add -f M 
netperf will then emit results in MB/s (M == 1048576).  I'm assuming of 
course that the MB/s of Apache and nginx are also M == 1048576.

happy benchmarking,

rick jones
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