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

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Date:	Fri, 21 Dec 2007 23:17:33 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Christoph Lameter <clameter@....com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: Major regression on hackbench with SLUB (more numbers)


On Fri, 2007-12-21 at 23:16 +0100, Peter Zijlstra wrote:
> On Fri, 2007-12-21 at 14:11 -0800, Christoph Lameter wrote:
> > On Fri, 21 Dec 2007, Linus Torvalds wrote:
> > 
> > > If you aren't even motivated to fix the problems that have been reported, 
> > > then SLUB isn't even a _potential_ solution, it's purely a problem, and 
> > > since I am not IN THE LEAST interested in having three different 
> > > allocators around, SLUB is going to get axed.
> > 
> > Not motivated? I have analyzed the problem in detail and when it comes 
> > down to it  there is not much impact that I can see in real life 
> > applications. I have always responded to the regression reported also via 
> > TPC-C. 
> 
> But you are dismissing the hackbench regression, which is not a small
> one. It runs an astonishing 10x slower.
> 

BTW, does /proc/slabinfo exist again? I thought we set that as a
requirement for SLUB to be the default and a full replacement for SLAB.


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