linux-kernel - Re: [PATCH 3/6] writeback: sync expired inodes first in background writeback

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Message-ID: <20110421010132.GE1814@dastard>
Date:	Thu, 21 Apr 2011 11:01:32 +1000
From:	Dave Chinner <david@...morbit.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Jan Kara <jack@...e.cz>, Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@...ux.vnet.ibm.com>,
	Mel Gorman <mel@....ul.ie>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	Itaru Kitayama <kitayama@...bb4u.ne.jp>,
	Minchan Kim <minchan.kim@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [PATCH 3/6] writeback: sync expired inodes first in background
 writeback

On Wed, Apr 20, 2011 at 03:38:22PM +0800, Wu Fengguang wrote:
> > make. Please test against a vanilla kernel if that is what you are
> > aiming these patches for. If you aren't aiming for a vanilla kernel,
> > please say so in the patch series header...
> 
> Here are the test results for vanilla kernel. It's again shows better
> numbers for dd, tar and overall run time.
> 
>              2.6.39-rc3   2.6.39-rc3-dyn-expire+
> ------------------------------------------------
> all elapsed     256.043      252.367
> stddev           24.381       12.530
> 
> tar elapsed      30.097       28.808
> dd  elapsed      13.214       11.782

The big reduction in run-to-run variance is very convincing - moreso
than the reduction in runtime - That's kind of what I had hoped
would occur once I understood the implications of the change. Thanks
for running the test to close the loop. :)

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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