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Date:	Wed, 27 Jun 2007 23:52:24 -0400
From:	Eric Sandeen <>
To:	sftf <>
Subject: Re: Performance testing results

sftf wrote:
> Hi!
>   IMHO this test is not 100% correct.
>   ext3 | data=writeback
>   ext4 | data=writeback,extents,delalloc
>   xfs  | defaults is ordered !
>  So you have compared ext's in writeback (which fastest mode) vs xfs in ordered.

Actually xfs's default (only) mode is more like writeback than ordered.
  So that's a fair comparison.   I bet it is xfs's barriers that hurt
it, though - while they are pretty much required on a single disk with a
volatile write cache, I think xfs's barrier implementation hurts it more
than barriers for ext*

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