Date: Tue, 22 Dec 2009 13:55:32 +0100
From: Jan Kara <jack@suse.cz>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Jan Kara <jack@suse.cz>, Steve Rago <sar@nec-labs.com>,
       Wu Fengguang <fengguang.wu@intel.com>,
       "linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
       "Trond.Myklebust@netapp.com" <Trond.Myklebust@netapp.com>,
       "jens.axboe" <jens.axboe@oracle.com>,
       Peter Staubach <staubach@redhat.com>
Subject: Re: [PATCH] improve the performance of large sequential write NFS workloads
Message-ID: <20091222125532.GC604@atrey.karlin.mff.cuni.cz>
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> On Tue, 2009-12-22 at 13:25 +0100, Jan Kara wrote:
> >   I believe that if we had per-bdi dirty_background_ratio and set it low
> > for NFS's bdi, 
> 
> There's two things there I think:
>  1) bdi_background
>  2) different background ratios per bdi
  Right.

> 1) could be 'trivially' done much like we do bdi_dirty in
> get_dirty_limits().
> 
> 2) I'm not at all convinced we want to go there.
  Yeah. Doing 1) and playing with bdi->min_ratio and bdi->max_ratio should
be the first thing we should try...

									Honza
-- 
Jan Kara <jack@suse.cz>
SuSE CR Labs
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