From: Dave Chinner <david@fromorbit.com>
To: Yann Dupont <Yann.Dupont@univ-nantes.fr>
Cc: stan@hardwarefreak.com, xfs@oss.sgi.com
Subject: Re: Bad performance with XFS + 2.6.38 / 2.6.39
Date: Thu, 22 Dec 2011 09:26:23 +1100 [thread overview]
Message-ID: <20111221222623.GF23662@dastard> (raw)
In-Reply-To: <4EF21DD2.3060004@univ-nantes.fr>
On Wed, Dec 21, 2011 at 06:56:34PM +0100, Yann Dupont wrote:
> Le 21/12/2011 16:10, Stan Hoeppner a écrit :
>
>
> >1. What mailbox format are you using? Is this a constant or variable?
>
> Maildir++
Which is what?
> >2. Is the Dovecot rev and config the same everywhere, before/after?
> Yes
> >3. Are Dovecot instances using NFS to access the XFS volumes?
> NO. direct LVM volumes from SAN
> >4. Is this a Dovecot 2.x cluster with director and NFS storage?
> >
> NO. This is dovecot plain & simple.
>
> When I go back to older kernels, the load go down. With newer
> kernel, all is working well too, but load (as reported by uptime) is
> higher.
Can you run a block trace on both kernels (for say five minutes)
when the load differential is showing up and provide that to us so
we can see how the IO patterns are differing?
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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next prev parent reply other threads:[~2011-12-21 22:26 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-11 12:45 Bad performance with XFS + 2.6.38 / 2.6.39 Xupeng Yun
2011-12-11 23:39 ` Dave Chinner
2011-12-12 0:40 ` Xupeng Yun
2011-12-12 1:00 ` Dave Chinner
2011-12-12 2:00 ` Xupeng Yun
2011-12-12 13:57 ` Christoph Hellwig
2011-12-21 9:08 ` Yann Dupont
2011-12-21 15:10 ` Stan Hoeppner
2011-12-21 17:56 ` Yann Dupont
2011-12-21 22:26 ` Dave Chinner [this message]
2011-12-22 9:23 ` Yann Dupont
2011-12-22 11:02 ` Yann Dupont
2012-01-02 10:06 ` Yann Dupont
2012-01-02 16:08 ` Peter Grandi
2012-01-02 18:02 ` Peter Grandi
2012-01-04 10:54 ` Yann Dupont
2012-01-02 20:35 ` Dave Chinner
2012-01-03 8:20 ` Yann Dupont
2012-01-04 12:33 ` Christoph Hellwig
2012-01-04 13:06 ` Yann Dupont
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