From: Eric Sandeen <sandeen@sandeen.net>
To: Steven Adams <stevezau@gmail.com>
Cc: xfs@oss.sgi.com
Subject: Re: Slow performance
Date: Sun, 25 Oct 2009 23:27:59 -0500 [thread overview]
Message-ID: <4AE5254F.3060105@sandeen.net> (raw)
In-Reply-To: <4AE4F4FC.5090900@gmail.com>
Steven Adams wrote:
> Hi All,
>
> I am using XFS for the first time of one of my servers. I was using
> rsync to copy the files from the old server to the new server and
> noticed that every 5-6 transfer the speeds would slow down to only
> 1-2MB/s and sometimes stop all together.
>
> I suspected this was due to the cache/memory getting filled up so XFS
> has to write the changes to the sata drive. I tried to turn off
> write-cache and nobarriers but still have the same problem..
>
> When i try it on the ext3 filesystem it runs at a constant transfer speed.
>
> Is this normal with the XFS filesystem?
>
We looked at this a bit on irc tonight and even streaming direct IO to a
contiguous xfs file was going very very slow. I think he also tested
direct IO reads from the device, and found them slow as well, so the
problem may well be beneath xfs.
-Eric
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prev parent reply other threads:[~2009-10-26 4:26 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-26 1:01 Slow performance Steven Adams
2009-10-26 4:27 ` Eric Sandeen [this message]
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