linux-kernel - Re: SLUB performance regression vs SLAB

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Message-Id: <1191616320.5838.26.camel@lappy>
Date:	Fri, 05 Oct 2007 22:32:00 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Chuck Ebbert <cebbert@...hat.com>
Cc:	David Miller <davem@...emloft.net>, willy@...ux.intel.com,
	clameter@....com, nickpiggin@...oo.com.au, hch@....de,
	mel@...net.ie, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, dgc@....com, jens.axboe@...cle.com,
	suresh.b.siddha@...el.com
Subject: Re: SLUB performance regression vs SLAB


On Thu, 2007-10-04 at 17:02 -0400, Chuck Ebbert wrote:
> On 10/04/2007 04:55 PM, David Miller wrote:
> > 
> > Anything, I do mean anything, can be simulated using small test
> > programs.
> 
> How do you simulate reading 100TB of data spread across 3000 disks,
> selecting 10% of it using some criterion, then sorting and summarizing
> the result?

Focus on the slab allocator usage, instrument it, record a trace,
generate a statistical model that matches, and write a small
programm/kernel module that has the same allocation pattern. Then verify
this statistical workload still shows the same performance difference.

Easy: no
Doable: yes



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