Messages in this thread | | | Date | Thu, 25 Jul 2013 18:50:58 +0530 | From | Raghavendra K T <> | Subject | Re: Hack bench regression with CONFIG_SLUB_CPU_PARTIAL disabled (info only) |
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On 07/25/2013 04:35 PM, Eric Dumazet wrote: > 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 ? >
tested now, hackbench 1x is almost 2 times slower (40 vs 93) hackbench 2x is almost 6times slower (90sec vs 528)
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