linux-kernel - Re: Free memory never fully used, swapping

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Message-ID: <alpine.DEB.2.00.1011260943220.12265@router.home>
Date:	Fri, 26 Nov 2010 09:48:14 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	Simon Kirby <sim@...tway.ca>, Mel Gorman <mel@....ul.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: Free memory never fully used, swapping

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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