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Re: observed significant performance improvement using "delaylog" in a r

To: linux-xfs@xxxxxxxxxxx
Subject: Re: observed significant performance improvement using "delaylog" in a real-world application
From: Peter Niemayer <niemayer@xxxxxx>
Date: Wed, 11 Aug 2010 20:08:33 +0200
In-reply-to: <20100811000854.GL26402@dastard>
References: <i3rt4t$46c$1@xxxxxxxxxxxxxxx> <20100811000854.GL26402@dastard>
User-agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv:1.9.2.7) Gecko/20100713 Thunderbird/3.1.1
On 08/11/2010 02:08 AM, Dave Chinner wrote:
One thing that you might want to try to
further improve performance is the logbsize=262144 option as well.
That will help flush log IO faster by doing less IOs.

Tried that - but this did not have a positive effect.
(In fact a slightly negative one, but that could be within
the measurement accuracy).

Also, if your workload is doing lots of fsync calls, then the
optimisations I posted a few days ago should also help improve
delaylog throughput.

We don't to any fsync's.

Regards,

Peter Niemayer


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