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Date: Tue, 2 Apr 2013 11:14:36 -0400
From: "Theodore Ts'o" <tytso@mit.edu>
To: Mel Gorman <mgorman@suse.de>, linux-ext4@vger.kernel.org,
        LKML <linux-kernel@vger.kernel.org>, Linux-MM <linux-mm@kvack.org>,
        Jiri Slaby <jslaby@suse.cz>
Subject: Re: Excessive stall times on ext4 in 3.9-rc2
Message-ID: <20130402151436.GC31577@thunk.org>
Mail-Followup-To: Theodore Ts'o <tytso@mit.edu>,
	Mel Gorman <mgorman@suse.de>, linux-ext4@vger.kernel.org,
	LKML <linux-kernel@vger.kernel.org>, Linux-MM <linux-mm@kvack.org>,
	Jiri Slaby <jslaby@suse.cz>
References: <20130402142717.GH32241@suse.de>
 <20130402150651.GB31577@thunk.org>
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On Tue, Apr 02, 2013 at 11:06:51AM -0400, Theodore Ts'o wrote:
> 
> 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.

Actually, sorry, I took a closer look and I'm not as sure going to
-rc4 is going to help (although we did have some ext4 patches to fix a
number of bugs that flowed in as late as -rc4).

Can you send us the patch that you used to get record these long stall
times?  And I assume you're using a laptop drive?  5400RPM or 7200RPM?

	      	     	    	    	   - Ted
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