linux-kernel - Re: [MMTests] dbench4 async on ext3

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Message-ID: <20120816145253.GB9057@quack.suse.cz>
Date:	Thu, 16 Aug 2012 16:52:53 +0200
From:	Jan Kara <jack@...e.cz>
To:	Mel Gorman <mgorman@...e.de>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [MMTests] dbench4 async on ext3

On Mon 23-07-12 22:21:46, Mel Gorman wrote:
> Configuration:	global-dhp__io-dbench4-async-ext3
> Result: 	http://www.csn.ul.ie/~mel/postings/mmtests-20120424/global-dhp__io-dbench4-async-ext3
> Benchmarks:	dbench4
> 
> Summary
> =======
> 
> In general there was a massive drop in throughput after 3.0. Very broadly
> speaking it looks like the Read operation got faster but at the cost of
> a big regression in the Flush operation.
  This looks bad. Also quickly looking into changelogs I don't see any
change which could cause this. I'll try to reproduce this and track it
down.

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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