From: Andrew Morton <akpm@linux-foundation.org>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Mel Gorman <mgorman@suse.de>, Sage Weil <sage@inktank.com>,
davem@davemloft.net, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, ceph-devel@vger.kernel.org,
neilb@suse.de, a.p.zijlstra@chello.nl, michaelc@cs.wisc.edu,
emunson@mgebm.net, sebastian@breakpoint.cc, cl@linux.com,
torvalds@linux-foundation.org
Subject: Re: regression with poll(2)
Date: Mon, 20 Aug 2012 16:20:46 -0700 [thread overview]
Message-ID: <20120820162046.f827f758.akpm@linux-foundation.org> (raw)
In-Reply-To: <1345455059.5158.302.camel@edumazet-glaptop>
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?
next prev parent reply other threads:[~2012-08-20 23:20 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-15 19:46 regression with poll(2)? Sage Weil
2012-08-15 20:45 ` Atchley, Scott
2012-08-15 21:03 ` Sage Weil
2012-08-19 18:49 ` regression with poll(2) Sage Weil
2012-08-20 8:07 ` Eric Dumazet
2012-08-20 9:04 ` Mel Gorman
2012-08-20 9:30 ` Eric Dumazet
2012-08-20 23:20 ` Andrew Morton [this message]
2012-08-21 5:16 ` Eric Dumazet
2012-08-20 16:54 ` Sage Weil
2012-08-21 7:05 ` Mel Gorman
2012-08-20 17:02 ` Linus Torvalds
2012-08-21 15:58 ` Andrew Morton
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