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: <20080805210125.A897.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Date:	Tue, 05 Aug 2008 21:06:25 +0900
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	kosaki.motohiro@...fujitsu.com,
	KOSAKI Motohiro <m-kosaki@...es.dti.ne.jp>,
	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:
> 
> > When hackbench running, SLUB consume memory very largely than SLAB.
> > then, SLAB often outperform SLUB in memory stavation state.
> > 
> > I don't know why memory comsumption different.
> > Anyone know it?
> 
> Can you quantify the difference?

machine spec:
CPU: IA64 x 8
MEM: 8G (4G x2node)

test method

1. echo 3 >/proc/sys/vm/drop_caches
2. % ./hackbench 90 process 1000       <- for fill pagetable cache
3. % ./hackbench 90 process 1000


vmstat result

<SLAB (without CONFIG_DEBUG_SLAB)>

procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 2  0      0 3223168   6016  38336    0    0     0     0 3181 4314  0 15 85  0  0
2039  2      0 2022144   6016  38336    0    0     0     0 2364 13622  0 49 51  0  0
634  0      0 2629824   6080  38336    0    0     0    64 83582 2538927  5 95  0  0  0
596  0      0 2842624   6080  38336    0    0     0     0 6864 675841  6 94  0  0  0
590  0      0 2993472   6080  38336    0    0     0     0 9514 456085  6 94  0  0  0
503  0      0 3138560   6080  38336    0    0     0     0 8042 276024  4 96  0  0  0

about 3G remain.

<SLUB>
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
1066  0      0 323008   3584  18240    0    0     0     0 12037 47353  1 99  0  0  0
1101  0      0 324672   3584  18240    0    0     0     0 6029 25100  1 99  0  0  0
913  0      0 330240   3584  18240    0    0     0     0 9694 54951  2 98  0  0  0

about 300M remain.


So, about 2.5G - 3G difference in 8G mem.




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