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Subject: Re: hackbench regression since 2.6.25-rc
From: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
To: Christoph Lameter <clameter@sgi.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
       Kay Sievers <kay.sievers@vrfy.org>, Greg Kroah-Hartman <gregkh@suse.de>,
       LKML <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>
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Date: Fri, 14 Mar 2008 11:04:02 +0800
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On Thu, 2008-03-13 at 17:16 -0700, Christoph Lameter wrote:
> Could you recompile the kernel with slub performance statistics and post 
> the output of
> 
> slabinfo -AD
Before testing with kernel 2.6.25-rc5:
Name                   Objects    Alloc     Free   %Fast
vm_area_struct            2795   135185   132587  93  29
:0004096                    25   119045   119043  99  98
:0000064                 12257   119671   107742  98  50
:0000192                  3312    78563    75370  92  21
:0000128                  4648    48143    43738  97  53
dentry                   15217    46675    31527  95  72
:0000080                 12784    33674    21206  99  97
:0000016                  4367    25871    23705  99  78
:0000096                  3001    22591    20084  99  92
buffer_head               5536    18147    12884  97  42
anon_vma                  1729    14948    14130  99  73


After testing:
Name                   Objects    Alloc     Free   %Fast
:0000192                  3428 80093958 80090708  92   8
:0000512                   374 80016030 80015715  68   7
vm_area_struct            2875   224524   221868  94  20
:0000064                 12408   134273   122227  98  47
:0004096                    24   127397   127395  99  98
:0000128                  4596    57837    53432  97  48
dentry                   15659    51402    35824  95  64
:0000016                  4584    29327    27161  99  76
:0000080                 12784    33674    21206  99  97
:0000096                  2998    26264    23757  99  93


So block 192 and 512's and very active and their fast free percentage is low.

-yanmin


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