Re: regression with poll(2)

[Eric Dumazet <eric.dumazet@xxxxxxxxx>]

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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