linux-kernel - Re: ext4 is faster with LVM than without, and other filesystem benchmarks

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Message-ID: <4BE4528C.5000305@sandeen.net>
Date:	Fri, 07 May 2010 12:49:00 -0500
From:	Eric Sandeen <sandeen@...deen.net>
To:	Bernd Eckenfels <bernd-10@...enfels.net>
CC:	linux-kernel@...r.kernel.org
Subject: Re: ext4 is faster with LVM than without, and other filesystem benchmarks

Bernd Eckenfels wrote:
> In article <20100507142310.GF13143@...kyla.fi> you wrote:
>> I think the most surprising result of the benchmarks is that ext4
>> seems to be significantly faster under LVM than on the raw /dev/sdd1
>> partition. Without LVM the variance in run times is much larger.
> 
> Sounds like the syncs/barriers never reach the disk with LVM. What mount
> journal/sync options did you use?  default?  Is dmesg telling you that
> barriers have been turned off for the lvm case?  IF yo uwant it fast and
> dirty try nobarrier,data=writeback :)

LVM barriers should be working in that kernel, though... still, comparing
mount -o nobarrier on each might yield a clue there.

-Eric

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