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SubjectRe: hackbench regression since 2.6.25-rc
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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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