From: Eric Sandeen <sandeen@sandeen.net>
To: Bernd Eckenfels <bernd-10@eckenfels.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: ext4 is faster with LVM than without, and other filesystem benchmarks
Date: Fri, 07 May 2010 12:49:00 -0500 [thread overview]
Message-ID: <4BE4528C.5000305@sandeen.net> (raw)
In-Reply-To: <201005071528.o47FSVas054141@neskaya.eckenfels.net>
Bernd Eckenfels wrote:
> In article <20100507142310.GF13143@lh.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
next prev parent reply other threads:[~2010-05-07 17:49 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-07 14:23 ext4 is faster with LVM than without, and other filesystem benchmarks Sami Liedes
2010-05-07 15:28 ` Bernd Eckenfels
2010-05-07 17:49 ` Eric Sandeen [this message]
2010-05-07 22:46 ` Dave Chinner
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