linux-kernel - Re: [patch 21/21] slab defrag: Obsolete SLAB

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Date:	Mon, 12 May 2008 10:54:47 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>
Cc:	"Rik van Riel" <riel@...hat.com>,
	"Andi Kleen" <andi@...stfloor.org>,
	"Christoph Lameter" <clameter@....com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	"Mel Gorman" <mel@...net.ie>, mpm@...enic.com,
	"Matthew Wilcox" <matthew@....cx>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Subject: Re: [patch 21/21] slab defrag: Obsolete SLAB

On Mon, May 12, 2008 at 10:38 AM, KOSAKI Motohiro
<kosaki.motohiro@...fujitsu.com> wrote:
> > > What about the TPC performance regressions? My understanding was that
> > > slub still performed worse in the "object allocated on one CPU, freed on
> > > the other CPU" type workloads due to less batching.
> >
> > Which can be the majority of object allocations and frees in some
> > workloads.  It definately wants fixing.
>
>  Agreed, that situation is very frequency happend, IMHO.

Christoph fixed a tbench regression that was in the same ballpark as
the TPC regression reported by Matthew which is why we've asked the
Intel folks to re-test. But yeah, we're working on it.
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