linux-kernel - Re: [RFC/PATCH] SLUB: dynamic per-cache MIN

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Date:	Tue, 12 Aug 2008 15:33:53 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Matthew Wilcox <matthew@....cx>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	akpm@...ux-foundation.org, cl@...ux-foundation.org
Subject: Re: [RFC/PATCH] SLUB: dynamic per-cache MIN_PARTIAL

Hi Matthew,

On Tue, Aug 05, 2008 at 12:39:36AM +0300, Pekka J Enberg wrote:
> > This patch changes the static MIN_PARTIAL to a dynamic per-cache ->min_partial
> > value that is calculated from object size. The bigger the object size, the more
> > pages we keep on the partial list.
> > 
> > I tested SLAB, SLUB, and SLUB with this patch on Jens Axboe's 'netio' example
> > script of the fio benchmarking tool. The script stresses the networking
> > subsystem which should also give a fairly good beating of kmalloc() et al.

On Tue, 2008-08-12 at 06:27 -0600, Matthew Wilcox wrote:
> We tested this patch and it was performance-neutral on TPC-C.  I was
> hoping it would give a nice improvement ... so I'm disappointed.  But at
> least there's no regression!

OK, so your regression is something else then. Well, thanks for testing!

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