linux-kernel - Re: regression with poll(2)

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Message-Id: <20120820162046.f827f758.akpm@linux-foundation.org>
Date:	Mon, 20 Aug 2012 16:20:46 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Mel Gorman <mgorman@...e.de>, 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,
	torvalds@...ux-foundation.org
Subject: Re: regression with poll(2)

On Mon, 20 Aug 2012 11:30:59 +0200
Eric Dumazet <eric.dumazet@...il.com> wrote:

> 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   

"seem to help"?  Was previous performance fully restored?
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