Re: Hack bench regression with CONFIG_SLUB_CPU_PARTIAL disabled(info only)

From: Eric Dumazet
Date: Thu Jul 25 2013 - 07:06:10 EST

On Thu, 2013-07-25 at 13:30 +0530, Raghavendra K T wrote:
> Hi,
> While testing hackbench with 3.11-rc1 I observed hackbench testcase
> took too long to complete (32 vcpu kvm guest on 32 core HT off machine).
> hackbench 1x degraded by 3 time (40sec vs 112sec)
> hackbench 2x degraded by around 20time (90sec vs 1800 sec)
> When I bisected, I found that I had CONFIG_SLUB_CPU_PARTIAL
> accidentally disabled.
> I understand that CONFIG_SLUB_CPU_PARTIAL=y by default and the config
> option is to provide determinism for RT kernels and thus it is not a
> problem.
> But thought of sharing this here so that if somebody runs into same
> issue accidently, it would save their time.

Incidentally, what difference do you currently get with SLUB and SLAB ?

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