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

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From: KOSAKI Motohiro <kosaki.motohiro@...>
To: Christoph Lameter <cl@...>
Cc: <kosaki.motohiro@...>, KOSAKI Motohiro <m-kosaki@...>, Matthew Wilcox <matthew@...>, Pekka Enberg <penberg@...>, <akpm@...>, <linux-kernel@...>, <linux-fsdevel@...>, Mel Gorman <mel@...>, <andi@...>, Rik van Riel <riel@...>
Subject: Re: No, really, stop trying to delete slab until you've finished making slub perform as well
Date: Tuesday, August 5, 2008 - 8:06 am

> KOSAKI Motohiro wrote:

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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[patch 00/19] Slab Fragmentation Reduction V13, Christoph Lameter, (Fri May 9, 10:21 pm)
No, really, stop trying to delete slab until you've finished..., Matthew Wilcox, (Sat Aug 2, 9:58 pm)
Re: No, really, stop trying to delete slab until you've fini..., Christoph Lameter, (Mon Aug 4, 9:43 am)
Re: No, really, stop trying to delete slab until you've fini..., KOSAKI Motohiro, (Mon Aug 4, 12:47 pm)
Re: No, really, stop trying to delete slab until you've fini..., Christoph Lameter, (Mon Aug 4, 1:19 pm)
Re: No, really, stop trying to delete slab until you've fini..., Christoph Lameter, (Mon Aug 4, 1:13 pm)
Re: No, really, stop trying to delete slab until you've fini..., KOSAKI Motohiro, (Tue Aug 5, 8:06 am)
Re: No, really, stop trying to delete slab until you've fini..., Christoph Lameter, (Tue Aug 5, 10:59 am)
Re: No, really, stop trying to delete slab until you've fini..., KOSAKI Motohiro, (Wed Aug 13, 6:46 am)
Re: No, really, stop trying to delete slab until you've fini..., Christoph Lameter, (Wed Aug 13, 9:10 am)
Re: No, really, stop trying to delete slab until you've fini..., Pekka Enberg, (Thu Aug 14, 3:15 am)
Re: No, really, stop trying to delete slab until you've fini..., Christoph Lameter, (Thu Aug 14, 11:06 am)
Re: No, really, stop trying to delete slab until you've fini..., Christoph Lameter, (Thu Aug 14, 10:45 am)
Re: No, really, stop trying to delete slab until you've fini..., KOSAKI Motohiro, (Wed Aug 13, 10:14 am)
Re: No, really, stop trying to delete slab until you've fini..., Christoph Lameter, (Wed Aug 13, 10:31 am)
Re: No, really, stop trying to delete slab until you've fini..., KOSAKI Motohiro, (Wed Aug 13, 11:05 am)
Re: No, really, stop trying to delete slab until you've fini..., Christoph Lameter, (Thu Aug 14, 3:44 pm)
Re: No, really, stop trying to delete slab until you've fini..., KOSAKI Motohiro, (Fri Aug 15, 12:44 pm)
Re: No, really, stop trying to delete slab until you've fini..., Christoph Lameter, (Fri Aug 15, 2:24 pm)
Re: No, really, stop trying to delete slab until you've fini..., Christoph Lameter, (Fri Aug 15, 3:42 pm)
Re: No, really, stop trying to delete slab until you've fini..., KOSAKI Motohiro, (Mon Aug 18, 6:08 am)
Re: No, really, stop trying to delete slab until you've fini..., KOSAKI Motohiro, (Mon Aug 18, 6:34 am)
Re: No, really, stop trying to delete slab until you've fini..., Christoph Lameter, (Mon Aug 18, 10:08 am)
Re: No, really, stop trying to delete slab until you've fini..., KOSAKI Motohiro, (Tue Aug 19, 6:34 am)
Re: No, really, stop trying to delete slab until you've fini..., Christoph Lameter, (Tue Aug 19, 9:51 am)
Re: No, really, stop trying to delete slab until you've fini..., KOSAKI Motohiro, (Wed Aug 20, 7:46 am)
Re: No, really, stop trying to delete slab until you've fini..., Pekka Enberg, (Wed Aug 13, 10:16 am)
Re: No, really, stop trying to delete slab until you've fini..., KOSAKI Motohiro, (Wed Aug 6, 8:36 am)
Re: No, really, stop trying to delete slab until you've fini..., Christoph Lameter, (Wed Aug 6, 10:24 am)
Re: No, really, stop trying to delete slab until you've fini..., Pekka Enberg, (Mon Aug 4, 1:20 pm)
Re: No, really, stop trying to delete slab until you've fini..., Rik van Riel, (Mon Aug 4, 11:11 am)
Re: No, really, stop trying to delete slab until you've fini..., Christoph Lameter, (Mon Aug 4, 12:02 pm)
Re: No, really, stop trying to delete slab until you've fini..., Jamie Lokier, (Mon Aug 4, 10:48 am)
Re: No, really, stop trying to delete slab until you've fini..., Jamie Lokier, (Mon Aug 4, 11:21 am)
Re: No, really, stop trying to delete slab until you've fini..., Christoph Lameter, (Mon Aug 4, 12:35 pm)
Re: No, really, stop trying to delete slab until you've fini..., Pekka Enberg, (Sun Aug 3, 5:25 pm)
Re: No, really, stop trying to delete slab until you've fini..., Rene Herman, (Sun Aug 3, 10:37 pm)
Re: No, really, stop trying to delete slab until you've fini..., Pekka Enberg, (Mon Aug 4, 5:22 pm)
Re: No, really, stop trying to delete slab until you've fini..., Christoph Lameter, (Mon Aug 4, 5:41 pm)
Re: No, really, stop trying to delete slab until you've fini..., Rene Herman, (Mon Aug 4, 7:09 pm)