linux-kernel - Re: [PATCH] improve the performance of large sequential write NFS workloads

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Message-ID: <20091222125532.GC604@atrey.karlin.mff.cuni.cz>
Date:	Tue, 22 Dec 2009 13:55:32 +0100
From:	Jan Kara <jack@...e.cz>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Jan Kara <jack@...e.cz>, Steve Rago <sar@...-labs.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	"linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Trond.Myklebust@...app.com" <Trond.Myklebust@...app.com>,
	"jens.axboe" <jens.axboe@...cle.com>,
	Peter Staubach <staubach@...hat.com>
Subject: Re: [PATCH] improve the performance of large sequential write NFS workloads

> 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@...e.cz>
SuSE CR Labs
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