netdev - Re: regression with poll(2)

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Date:	Mon, 20 Aug 2012 11:30:59 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Sage Weil <sage@...tank.com>, davem@...emloft.net,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	ceph-devel@...r.kernel.org, neilb@...e.de, a.p.zijlstra@...llo.nl,
	michaelc@...wisc.edu, emunson@...bm.net, sebastian@...akpoint.cc,
	cl@...ux.com, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org
Subject: Re: regression with poll(2)

On Mon, 2012-08-20 at 10:04 +0100, Mel Gorman wrote:

> Can the following patch be tested please? It is reported to fix an fio
> regression that may be similar to what you are experiencing but has not
> been picked up yet.
> 
> -

This seems to help here.

Boot your machine with "mem=768M" or a bit less depending on your setup,
and try a netperf.

-> before patch :

# netperf
MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
localhost.localdomain () port 0 AF_INET
Recv   Send    Send                          
Socket Socket  Message  Elapsed              
Size   Size    Size     Time     Throughput  
bytes  bytes   bytes    secs.    10^6bits/sec  

 87380  16384  16384    14.00       6.05   

-> after patch :

Recv   Send    Send                          
Socket Socket  Message  Elapsed              
Size   Size    Size     Time     Throughput  
bytes  bytes   bytes    secs.    10^6bits/sec  

 87380  16384  16384    10.00    18509.73   

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