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Re: Performance degradation over time

To: Eric Sandeen <sandeen@xxxxxxxxxxx>
Subject: Re: Performance degradation over time
From: Marcin Deranek <marcin.deranek@xxxxxxxxxxx>
Date: Thu, 11 Oct 2012 10:33:52 +0200
Cc: stan@xxxxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx
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Hi Eric,

On Wed, 10 Oct 2012 09:31:16 -0500
Eric Sandeen <sandeen@xxxxxxxxxxx> wrote:

> Yep.  Ditch that; it overrides the maintained module that comes with
> the kernel itself.  See if that helps, first, I suppose.

I wasn't aware that stock kernel comes with xfs module. From my testing
looks like stock kernel module is still preferred over kmod-xfs:

# modinfo xfs
filename:       /lib/modules/2.6.18-308.el5/kernel/fs/xfs/xfs.ko
license:        GPL
description:    SGI XFS with ACLs, security attributes, large block/inode 
numbers, no debug enabled
author:         Silicon Graphics, Inc.
srcversion:     D37A003AFEE1A42BDD4DD56
depends:        
vermagic:       2.6.18-308.el5 SMP mod_unload gcc-4.1
module_sig:
883f3504f44471c48d0a1fbae482c4c11225a009e3fa1179850eea96ab882c910d750e88743fec5309d1ca09de3d81add6999f9dedc65f84a0d1e21293

Most likely due to historical reasons we still install kmod-xfs on our 
systems.
To be sure I have removed kmod-xfs, unmounted filesystem and removed
kernel module and them mounted filesystem again. Still seeing the very same
behaviour.

> Agreed that it would be good to know whether inode64 is in use.

No, we don't use any special mount options here.

> Let's start there (and with a modern xfs.ko) before we speculate
> further.

I guess next step would be to use inode64..
Regards,

Marcin

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