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List: linux-xfs
Subject: Re: XFS performance problems on Linux x86_64
From: David Chinner <dgc () sgi ! com>
Date: 2007-11-27 22:05:36
Message-ID: 20071127220536.GL119954183 () sgi ! com
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On Tue, Nov 27, 2007 at 10:20:05PM +0100, Johan Andersson wrote:
> Hi!
>
> I am using Gentoo Linux on XFS root filesystem on a number of machines,
> where some are P4 based i686, and some new are Intel Core 2 Duo based
> x86_64 based.
> When the new x86_64 based machines were put into service, we noticed
> that they are extremely slow on file io. I have now created two test
> partitions, each 5G in size, on the same disk. One is xfs and one is
> ext3, both filesystems created with default options. My simple test is
> to rsync our local portage tree to the 5G partition:
> =====================================================================
> tmpc-masv2 xfs # time rsync -r --delete rsync://devsrv/portage portage
>
> real 5m55.037s
> user 0m1.291s
> sys 0m10.352s
>
> ======================================================================
> tmpc-masv2 ext3 # time rsync -r --delete rsync://devsrv/portage portage
>
> real 0m28.943s
> user 0m1.095s
> sys 0m5.384s
>
> I have repeated this a number of times to make sure caching on the
> server does not interfere, with about the same results every time.
>
> Any idea why XFS appears to be 12 times slower than ext3 on the 64-bit
> machine?
# mkfs.xfs -f -l lazy-count=1,version=2,size=128m -i attr=2 -d agcount=4 <dev>
# mount -o logbsize=256k <dev> <mtpt>
And if you don't care about filsystem corruption on power loss:
# mount -o logbsize=256k,nobarrier <dev> <mtpt>
Those mkfs values (except for log size) will be hte defaults in the next
release of xfsprogs.
Cheers,
Dave.
--
Dave Chinner
Principal Engineer
SGI Australian Software Group
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