linux-kernel - Re: [PATCH 8/8] vm: Add an tuning knob for vm.max_writeback

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Message-ID: <20090901184455.GA27294@infradead.org>
Date:	Tue, 1 Sep 2009 14:44:55 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Jens Axboe <jens.axboe@...cle.com>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, chris.mason@...cle.com,
	david@...morbit.com, hch@...radead.org, tytso@....edu,
	akpm@...ux-foundation.org, jack@...e.cz
Subject: Re: [PATCH 8/8] vm: Add an tuning knob for vm.max_writeback_pages

On Tue, Sep 01, 2009 at 08:38:55PM +0200, Peter Zijlstra wrote:
> Do we really need a tunable for this?

It will make increasing it in the field a lot easier.  And having deal
with really large systems I have the fear that there are I/O topologies
outhere for which every "reasonable" value is too low.

> I guess we need a limit to avoid it writing out everything, but can't we
> have something automagic?

Some automatic adjustment would be nice.  But finding the right auto
tuning will be an interesting exercise.

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