Re: Major regression on hackbench with SLUB (more numbers)
[Posted December 28, 2007 by corbet]
| From: |
| "Pekka Enberg" <penberg-AT-cs.helsinki.fi> |
| To: |
| "Ingo Molnar" <mingo-AT-elte.hu> |
| Subject: |
| Re: Major regression on hackbench with SLUB (more numbers) |
| Date: |
| Fri, 21 Dec 2007 19:44:12 +0200 |
| Message-ID: |
| <84144f020712210944q3e0539f8vd8a249f69d456dc7@mail.gmail.com> |
| Cc: |
| "Christoph Lameter" <clameter-AT-sgi.com>,
"Steven Rostedt" <rostedt-AT-goodmis.org>,
LKML <linux-kernel-AT-vger.kernel.org>,
"Andrew Morton" <akpm-AT-linux-foundation.org>,
"Linus Torvalds" <torvalds-AT-linux-foundation.org>,
"Peter Zijlstra" <a.p.zijlstra-AT-chello.nl>,
"Christoph Hellwig" <hch-AT-infradead.org>,
"Rafael J. Wysocki" <rjw-AT-sisk.pl> |
| Archive‑link: | |
Article |
Hi,
Christoph Lameter <clameter@sgi.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@elte.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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