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observed significant performance improvement using "delaylog" in a real-

To: linux-xfs@xxxxxxxxxxx
Subject: observed significant performance improvement using "delaylog" in a real-world application
From: Peter Niemayer <niemayer@xxxxxx>
Date: Tue, 10 Aug 2010 18:01:33 +0200
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Hi all,

we use XFS for a very I/O-intensive, in-house developed real-time database application, and whenever we see new or significantly changed file-systems becoming available, we run a benchmark using this application on a conserved, fixed real-world data set.

I'm pleased to state that using the experimental "delaylog" mount option (in vanilla linux-2.6.35) we measured a 17% performance increase
for our benchmark scenario. (Other mount-options in use both before
and after the "delaylog" option: noatime,nodiratime,nobarrier)

That's a lot given that XFS was the fastest performing file-system
for this application already.

It's also a promising result regarding stability, as several other
tests (using e.g. reiser4 or ceph) in the past led to crashes in the
same benchmark scenario.

So thanks to all contributing developers for this significant optimization!


Peter Niemayer

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