From: "Sébastien Dugué" <sebastien.dugue@bull.net>
To: suparna@in.ibm.com
Cc: linux-aio@kvack.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: aio-stress throughput regressions from 2.6.11 to 2.6.12
Date: Mon, 11 Jul 2005 09:43:06 +0200 [thread overview]
Message-ID: <1121067786.2196.62.camel@frecb000686> (raw)
In-Reply-To: <20050701075600.GC4625@in.ibm.com>
On Fri, 2005-07-01 at 13:26 +0530, Suparna Bhattacharya wrote:
> Has anyone else noticed major throughput regressions for random
> reads/writes with aio-stress in 2.6.12 ?
> Or have there been any other FS/IO regressions lately ?
>
> On one test system I see a degradation from around 17+ MB/s to 11MB/s
> for random O_DIRECT AIO (aio-stress -o3 testext3/rwfile5) from 2.6.11
> to 2.6.12. It doesn't seem filesystem specific. Not good :(
>
> BTW, Chris/Ben, it doesn't look like the changes to aio.c have had an impact
> (I copied those back to my 2.6.11 tree and tried the runs with no effect)
> So it is something else ...
>
> Ideas/thoughts/observations ?
>
> Regards
> Suparna
>
I'm too seeing a regression, but between 2.6.10 and 2.6.12 and using
sysbench + MySQL (with POSIX AIO). The difference is roughly 8% slower
for 2.6.12. I'm currently trying to trace it.
aio-stress shows no difference so it probably does not come from
kernel AIO.
Sébastien.
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prev parent reply other threads:[~2005-07-11 7:43 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-01 7:56 aio-stress throughput regressions from 2.6.11 to 2.6.12 Suparna Bhattacharya
2005-07-01 14:25 ` Benjamin LaHaise
2005-07-06 4:30 ` Suparna Bhattacharya
2005-07-08 17:58 ` Benjamin LaHaise
2005-07-05 14:00 ` Chris Mason
2005-07-05 16:12 ` Benjamin LaHaise
2005-07-06 10:37 ` Suparna Bhattacharya
2005-07-06 12:10 ` aio-stress regressions in 2.6.12 narrowed down to AIC7xxx Suparna Bhattacharya
2005-07-11 7:43 ` Sébastien Dugué [this message]
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