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

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Date:	Fri, 14 Dec 2007 01:15:54 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Christoph Lameter <clameter@....com>
cc:	Ingo Molnar <mingo@...e.hu>, 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>
Subject: Re: Major regression on hackbench with SLUB (more numbers)


Christoph,

Welcome back from your vacation! :-)

On Thu, 13 Dec 2007, Christoph Lameter 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
>

I booted back to slub with slub_min_order=9 on the 64way and you are
indeed right about this.

# tests/hackbench 90
Time: 2.109
# chrt -f 10 tests/hackbench 90
Time: 3.775
# tests/hackbench 90
Time: 1.583
# chrt -f 10 tests/hackbench 90
Time: 1.833
# tests/hackbench 90
Time: 1.601
# chrt -f 10 tests/hackbench 90
Time: 3.078
# tests/hackbench 90
Time: 1.321
# chrt -f 10 tests/hackbench 90
Time: 1.933



A flux between 1.321 and 3.775 (*)(the rt runs were higher). But still,
good job at narrowing this down. Now the hard part. Figuring out a way
that will be nice to all users.

-- Steve

(*) The previous runs (without the command line option) were 13 seconds or
so.
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