linux-kernel - Re: Major regression on hackbench with SLUB (more numbers)

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Message-ID: <84144f020712211540i33cbd11ke9fcd842980e5689@mail.gmail.com>
Date:	Sat, 22 Dec 2007 01:40:37 +0200
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Christoph Lameter" <clameter@....com>,
	"Steven Rostedt" <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Christoph Hellwig" <hch@...radead.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: Major regression on hackbench with SLUB (more numbers)

Hi,

On Dec 22, 2007 1:17 AM, Ingo Molnar <mingo@...e.hu> wrote:
> yep, and i ran a quick comparison test on a 2-core box with 3 kernels:
>
>   [ best of 5 runs in a row which had a relative jitter of less than 10% ]
>
>      MIN      v2.6.24.slab     v2.6.24.slub v2.6.24.slub.fix
>   ----------------------------------------------------------
>            mmap:    429.00    402.00 ( -6%)    385.00 (-10%)
>          select:     11.38     10.46 ( -8%)     11.41 (  0%)
>       proc-exec:    121.52    116.77 ( -3%)    120.77 (  0%)
>       proc-fork:    106.84    106.19 (  0%)    107.92 (  1%)
>    syscall-open:      3.09      3.13 (  1%)      3.25 (  4%)
>    hackbench-50:      2.85      3.47 ( 21%)      2.88 (  1%)
>
> and the regression seems to be largely fixed! Not only is the hackbench
> one fixed, but mmap shows an above-noise improvement as well.
>
> Acked-by: Ingo Molnar <mingo@...e.hu>

I thought it might be a bug but couldn't figure it out. The patch
looks good to me too, Christoph.

Reviewed-by: Pekka Enberg <penberg@...helsinki.fi>

On Dec 22, 2007 1:17 AM, Ingo Molnar <mingo@...e.hu> wrote:
> And i hereby nominate Pekka as SLUB/SLAB co-maintainer and spokesperson
> ;-)

Heh, thanks, but grep me from MAINTAINERS some day, Ingo :-).

                                Pekka
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