linux-kernel - Re: No, really, stop trying to delete slab until you've finished making slub perform as well

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Message-ID: <48972FBF.9040100@linux-foundation.org>
Date:	Mon, 04 Aug 2008 11:35:11 -0500
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Jamie Lokier <jamie@...reable.org>
CC:	Matthew Wilcox <matthew@....cx>,
	Pekka Enberg <penberg@...helsinki.fi>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, Mel Gorman <mel@...net.ie>,
	andi@...stfloor.org, Rik van Riel <riel@...hat.com>
Subject: Re: No, really, stop trying to delete slab until you've finished
 making slub perform as well

Jamie Lokier wrote:

> The different behaviours of SLAB/SLUB might result in different levels
> of fragmentation, so I wonder if anyone has compared them on MMU-less
> systems or fragmentation-sensitive workloads on general systems.

Never heard of such a comparison.

MMU less systems typically have a minimal number of processors. For that
configuration the page orders are roughly equivalent to slab. Larger orders
come into play with large amounts of processors.
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