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Re: disk performance strange/low

To: Michael Monnerie <michael.monnerie@xxxxxxxxxxxxxxxxxxx>
Subject: Re: disk performance strange/low
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Wed, 26 Aug 2009 13:56:04 -0400
Cc: xfs@xxxxxxxxxxx
In-reply-to: <200908261920.47054@xxxxxx>
References: <200908172311.07660@xxxxxx> <200908180408.10738@xxxxxx> <20090818024350.GA3591@xxxxxxxxxxxxx> <200908261920.47054@xxxxxx>
User-agent: Mutt/1.5.19 (2009-01-05)
On Wed, Aug 26, 2009 at 07:20:36PM +0200, Michael Monnerie wrote:
> On Dienstag 18 August 2009 Christoph Hellwig wrote:
> > On Tue, Aug 18, 2009 at 04:08:05AM +0200, Michael Monnerie wrote:
> > > On Montag 17 August 2009 Christoph Hellwig wrote:
> > > > Yes, that sounds like the problem of the VM not feeding us enough
> > > > pages to write. ?What kernel is this on? ?Latest 2.6.31-rc has a
> > > > workaround for it.
> > >
> > > 2.6.27.23-0.1-xen from openSUSE 11.1
> > > I can't switch as I use it with the free Xen. Thanks for the info.
> >
> > Try backporting commit c8a4051c3731b6db224482218cfd535ab9393ff8 from
> > mainline - it should apply just fine to a 2.6.27-ish kernel.
> 
> Thank you. I'm not a patcher, could you tell me how to do that?

Just take the patch I attached and apply it using

        patch -p1 < xfs-nr-to-write.diff

if you want to make sure it applies cleanly do a

        patch -p1 --dry-run < xfs-nr-to-write.diff

beforee to check if it doesn't cause any reject.

After that rebuild your kernel.

Attachment: xfs-nr-to-write.diff
Description: Text document

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