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SubjectRe: regression with poll(2)
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On Mon, 2012-08-20 at 16:20 -0700, Andrew Morton wrote:
> On Mon, 20 Aug 2012 11:30:59 +0200
> Eric Dumazet <eric.dumazet@gmail.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?

I did some tests this morning on my HP Z600, and got same numbers than
3.5.0

Of course, its a bit difficult to say, because there is no
CONFIG_PFMEMALLOC to test real impact.





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