Subject: Re: regression with poll(2)

From: Andrew Morton <[email-masked]>
Date: Mon, 20 Aug 2012 16:20:46 -0700

On Mon, 20 Aug 2012 11:30:59 +0200
Eric Dumazet <[email-masked]> 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?