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

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Message-ID: <84144f020712210944q3e0539f8vd8a249f69d456dc7@mail.gmail.com>
Date:	Fri, 21 Dec 2007 19:44:12 +0200
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Christoph Lameter" <clameter@....com>,
	"Steven Rostedt" <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linus Torvalds" <torvalds@...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,

Christoph Lameter <clameter@....com> wrote:
> > In an extreme case (boot with slub_min_order=9 to get huge page sized
> > slabs) SLUB can win against SLAB:
> >
> > N=10 Time: 0.338      Minimally faster
> > N=20 Time: 0.560      10% faster
> > N=50 Time: 1.353      15% faster

On Dec 21, 2007 2:09 PM, Ingo Molnar <mingo@...e.hu> wrote:
> what's up with this regression? There's been absolutely no activity
> about it in the last 8 days: upstream still regresses, -mm still
> regresses and there are no patches posted for testing.

Christoph, did you see Steven's oprofile results for the hackbench
runs (http://lkml.org/lkml/2007/12/8/198)? Any ideas why we're hitting
add_partial like crazy?

                                Pekka
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