linux-kernel - Re: Excessive stall times on ext4 in 3.9-rc2

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Message-ID: <20130402150651.GB31577@thunk.org>
Date:	Tue, 2 Apr 2013 11:06:51 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Mel Gorman <mgorman@...e.de>
Cc:	linux-ext4@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>, Jiri Slaby <jslaby@...e.cz>
Subject: Re: Excessive stall times on ext4 in 3.9-rc2

On Tue, Apr 02, 2013 at 03:27:17PM +0100, Mel Gorman wrote:
> I'm testing a page-reclaim-related series on my laptop that is partially
> aimed at fixing long stalls when doing metadata-intensive operations on
> low memory such as a git checkout. I've been running 3.9-rc2 with the
> series applied but found that the interactive performance was awful even
> when there was plenty of free memory.

Can you try 3.9-rc4 or later and see if the problem still persists?
There were a number of ext4 issues especially around low memory
performance which weren't resolved until -rc4.

Thanks,

						- Ted
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