Date: Fri, 26 Nov 2010 09:48:14 -0600 (CST)
From: Christoph Lameter <cl@linux.com>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
cc: Simon Kirby <sim@hostway.ca>, Mel Gorman <mel@csn.ul.ie>,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-kernel <linux-kernel@vger.kernel.org>, linux-mm@kvack.org
Subject: Re: Free memory never fully used, swapping
In-Reply-To: <20101125101803.F450.A69D9226@jp.fujitsu.com>
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References: <20101124092753.GS19571@csn.ul.ie> <20101124191749.GA29511@hostway.ca> <20101125101803.F450.A69D9226@jp.fujitsu.com>
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On Thu, 25 Nov 2010, KOSAKI Motohiro wrote:
> Please try SLAB instead SLUB (it can be switched by kernel build option).
> SLUB try to use high order allocation implicitly.

SLAB uses orders 0-1. Order is fixed per slab cache and determined based
on object size at slab creation.

SLUB uses orders 0-3. Falls back to smallest order if alloc order cannot
be met by the page allocator.

One can reduce SLUB to SLAB orders by specifying the following kernel
commandline parameter:

slub_max_order=1
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