linux-ext4 - Re: [PATCH 3/3] mm: slub: Default slub_max

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Message-ID: <1305225467.2575.66.camel@mulgrave.site>
Date:	Thu, 12 May 2011 13:37:47 -0500
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Christoph Lameter <cl@...ux.com>, Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Colin King <colin.king@...onical.com>,
	Raghavendra D Prabhu <raghu.prabhu13@...il.com>,
	Jan Kara <jack@...e.cz>, Chris Mason <chris.mason@...cle.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 3/3] mm: slub: Default slub_max_order to 0

On Thu, 2011-05-12 at 18:55 +0300, Pekka Enberg wrote:
> On Thu, 2011-05-12 at 10:43 -0500, James Bottomley wrote:
> > However, since you admit even you see problems, let's concentrate on
> > fixing them rather than recriminations?
> 
> Yes, please. So does dropping max_order to 1 help?
> PAGE_ALLOC_COSTLY_ORDER is set to 3 in 2.6.39-rc7.

Just booting with max_slab_order=1 (and none of the other patches
applied) I can still get the machine to go into kswapd at 99%, so it
doesn't seem to make much of a difference.

Do you want me to try with the other two patches and max_slab_order=1?

James


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