Re: Major regression on hackbench with SLUB (more numbers)

Pekka Enberg
2007-12-21T23:40:49Z

Hi,

On Dec 22, 2007 1:17 AM, Ingo Molnar <mingo@elte.hu> wrote:
> yep, and i ran a quick comparison test on a 2-core box with 3 kernels:
>
> [ best of 5 runs in a row which had a relative jitter of less than 10% ]
>
> MIN v2.6.24.slab v2.6.24.slub v2.6.24.slub.fix
> ----------------------------------------------------------
> mmap: 429.00 402.00 ( -6%) 385.00 (-10%)
> select: 11.38 10.46 ( -8%) 11.41 ( 0%)
> proc-exec: 121.52 116.77 ( -3%) 120.77 ( 0%)
> proc-fork: 106.84 106.19 ( 0%) 107.92 ( 1%)
> syscall-open: 3.09 3.13 ( 1%) 3.25 ( 4%)
> hackbench-50: 2.85 3.47 ( 21%) 2.88 ( 1%)
>
> and the regression seems to be largely fixed! Not only is the hackbench
> one fixed, but mmap shows an above-noise improvement as well.
>
> Acked-by: Ingo Molnar <mingo@elte.hu>

I thought it might be a bug but couldn't figure it out. The patch
looks good to me too, Christoph.

Reviewed-by: Pekka Enberg <penberg@cs.helsinki.fi>

On Dec 22, 2007 1:17 AM, Ingo Molnar <mingo@elte.hu> wrote:
> And i hereby nominate Pekka as SLUB/SLAB co-maintainer and spokesperson
> ;-)

Heh, thanks, but grep me from MAINTAINERS some day, Ingo :-).

Pekka