linux-kernel - Re: No, really, stop trying to delete slab until you've finished making slub perform as well

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Message-ID: <4899B418.9050509@linux-foundation.org>
Date:	Wed, 06 Aug 2008 09:24:24 -0500
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC:	Matthew Wilcox <matthew@....cx>,
	Pekka Enberg <penberg@...helsinki.fi>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, Mel Gorman <mel@...net.ie>,
	andi@...stfloor.org, Rik van Riel <riel@...hat.com>
Subject: Re: No, really, stop trying to delete slab until you've finished
 making slub perform as well

KOSAKI Motohiro wrote:
>>>> Can you quantify the difference?
>>> machine spec:
>>> CPU: IA64 x 8
>>> MEM: 8G (4G x2node)
>> 16k or 64k page size?
> 
> 64k.
> 
> 
>>> So, about 2.5G - 3G difference in 8G mem.
>> Well not sure if that tells us much. Please show us the output of
>> /proc/meminfo after each run. The slab counters indicate how much memory is
>> used by the slabs.
>>
>> It would also be interesting to see the output of the slabinfo command after
>> the slub run?
> 
> ok.
> but i can't do that in this week.
> so, I'll do it in next week.
> 
> honestly, I don't know how to use slabinfo command :-)

Its in linux/Documentation/vm/slabinfo.c

Do

	gcc -o slabinfo Documentation/vm/slabinfo.c

	./slabinfo

(./slabinfo -h if you are curious and want to use more advanced options)

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