linux-kernel - Re: [patch] SLQB slab allocator (try 2)

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Message-ID: <4999C1CE.8080002@cs.helsinki.fi>
Date:	Mon, 16 Feb 2009 21:43:10 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Mel Gorman <mel@....ul.ie>
CC:	Nick Piggin <nickpiggin@...oo.com.au>,
	Nick Piggin <npiggin@...e.de>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Lin Ming <ming.m.lin@...el.com>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: [patch] SLQB slab allocator (try 2)

Mel Gorman wrote:
> On Mon, Feb 16, 2009 at 09:17:58PM +0200, Pekka Enberg wrote:
>> Hi Mel,
>>
>> Mel Gorman wrote:
>>> I haven't done much digging in here yet. Between the large page bug and
>>> other patches in my inbox, I haven't had the chance yet but that doesn't
>>> stop anyone else taking a look.
>> So how big does an improvement/regression have to be not to be  
>> considered within noise? I mean, I randomly picked one of the results  
>> ("x86-64 speccpu integer tests") and ran it through my "summarize"  
>> script and got the following results:
>>
>> 		min      max      mean     std_dev
>>   slub		0.96     1.09     1.01     0.04
>>   slub-min	0.95     1.10     1.00     0.04
>>   slub-rvrt	0.90     1.08     0.99     0.05
>>   slqb		0.96     1.07     1.00     0.04
>>
> 
> Well, it doesn't make a whole pile of sense to get the average of these ratios
> or the deviation between them. Each of the tests behave very differently.

Uhm, yes. I need to learn to read one of these days.

			Pekka
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