linux-kernel - Re: [RFC PATCH] greatly reduce SLOB external fragmentation

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Message-ID: <4891E2BF.4090304@linux-foundation.org>
Date:	Thu, 31 Jul 2008 11:05:19 -0500
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Matt Mackall <mpm@...enic.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pekka J Enberg <penberg@...helsinki.fi>,
	Christoph Lameter <clameter@....com>,
	Ingo Molnar <mingo@...e.hu>, Hugh Dickins <hugh@...itas.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	vegard.nossum@...il.com, hannes@...urebad.de, matthew@....cx
Subject: Re: [RFC PATCH] greatly reduce SLOB external fragmentation

Andi Kleen wrote:
> On Thu, Jul 31, 2008 at 10:25:45AM -0500, Christoph Lameter wrote:
>> Andi Kleen wrote:
>>>> Finally getting rid of SLAB is a much trickier proposition because SLUB
>>>> still loses in a few important corner cases.
>>> The big issue is that we haven't really made much progress on at least
>>> some of these test cases (like the database benchmarks) for quite some
>>> time (and that wasn't for a lack of trying) :-/ Might be a fundamental
>>> problem.
>> It would be good to have more of these benchmark regressions than just TPC which requires a database setup etc etc. Preferably something that is easily runnable by everyone.
> 
> AFAIK willy had a small test case for at least one of them.

He is developing a scsi performance test program that showed a regression but it was proprietary last time I heard of it. Maybe its now available?

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