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

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Date:	Fri, 21 Dec 2007 13:09:08 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Christoph Lameter <clameter@....com>
Cc:	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)


* Christoph Lameter <clameter@....com> wrote:

> Hmmmm... Some tests here on an 8p 8G machine:

> 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

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.

being able to utilize order-0 pages was supposed to be one of the big 
plusses of SLUB, so booting with _2MB_ sized slabs cannot be seriously 
the "fix", right?

	Ingo
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