linux-kernel - Re: [RFC][PATCH] mm: stop balance_dirty

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Message-ID: <20090626050245.GL31415@kernel.dk>
Date:	Fri, 26 Jun 2009 07:02:45 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Al Boldi <a1426z@...ab.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Richard Kennedy <richard@....demon.co.uk>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] mm: stop balance_dirty_pages doing too much work

On Thu, Jun 25 2009, Al Boldi wrote:
> Jens Axboe wrote:
> > The test case is random mmap writes to files that have been laid out
> > sequentially. So it's all seeks. The target drive is an SSD disk though,
> > so it doesn't matter a whole lot (it's a good SSD).
> 
> Oh, SSD.  What numbers do you get for normal disks?

I haven't run this particular test on rotating storage. The type of
drive should not matter a lot, I'm mostly interested in comparing
vanilla and the writeback patches on identical workloads and storage.

-- 
Jens Axboe

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