linux-ext4 - Re: [PATCH, RFC] vm: Add an tuning knob for vm.max_writeback

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Message-ID: <20090901203022.GD6996@mit.edu>
Date:	Tue, 1 Sep 2009 16:30:22 -0400
From:	Theodore Tso <tytso@....edu>
To:	Chris Mason <chris.mason@...cle.com>,
	Christoph Hellwig <hch@...radead.org>, linux-mm@...ck.org,
	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org, jens.axboe@...cle.com
Subject: Re: [PATCH, RFC] vm: Add an tuning knob for vm.max_writeback_pages

On Tue, Sep 01, 2009 at 02:00:52PM -0400, Chris Mason wrote:
> 
> I haven't yet tried this without the max_writeback_pages patch, but the
> graphs clearly show a speed improvement, and that the mainline code is
> smearing writes across the drive while Jens' work is writing
> sequentially.

FYI, you don't need to revert the max_writebacks_pages patch; the
whole point of making it a tunable was to make it easier to run
benchmarks.  If you want to get the effects of the original setting of
MAX_WRITEBACK_PAGES before the patch, just run as root: 

    sysctl vm.max_writeback_pages=1024

						- Ted
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