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

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Date:	Sat, 22 Dec 2007 00:17:28 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Christoph Lameter <clameter@....com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	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)


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> And now, can the people who made the problem reports and complained 
> about SLUB please test the patch - the ball is now in your court!

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>

And i hereby nominate Pekka as SLUB/SLAB co-maintainer and spokesperson 
;-)

	Ingo
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