linux-kernel - Re: [patch 21/21] slab defrag: Obsolete SLAB

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Date:	Thu, 15 May 2008 23:30:53 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Matthew Wilcox <matthew@....cx>
CC:	Christoph Lameter <clameter@....com>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Andi Kleen <andi@...stfloor.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Mel Gorman <mel@...net.ie>, mpm@...enic.com
Subject: Re: [patch 21/21] slab defrag: Obsolete SLAB

Matthew Wilcox wrote:
> This is rather interesting.  Since Christoph refuses to, here's my
> results with 8f40f67, first with slab:
> 
> Now, change the config to slub:

[snip]

> and we get slightly better results:
> 
> willy@...gy:~$ sudo ./io-gen -d /dev/sda -j4
> CPU 0 completed 1000000 ops in 45.848 seconds; 21811 ops per second
> CPU 2 completed 1000000 ops in 50.789 seconds; 19689 ops per second
> CPU 3 completed 1000000 ops in 55.876 seconds; 17896 ops per second
> CPU 1 completed 1000000 ops in 56.941 seconds; 17562 ops per second
> willy@...gy:~$ sudo taskset -p 1 1001
> pid 1001's current affinity mask: f
> pid 1001's new affinity mask: 1
> willy@...gy:~$ sudo ./io-gen -d /dev/sda -j4
> CPU 2 completed 1000000 ops in 45.713 seconds; 21875 ops per second
> CPU 0 completed 1000000 ops in 47.020 seconds; 21267 ops per second
> CPU 3 completed 1000000 ops in 58.692 seconds; 17038 ops per second
> CPU 1 completed 1000000 ops in 60.389 seconds; 16559 ops per second

Slabinfo -A -r before and after the run would be nice (you 
CONFIG_SLUB_STATS and Documentation/vm/slabinfo.c for the latter). A 
separate oprofile would be nice as well. Thanks!

		Pekka
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