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SubjectRe: [slub p4 0/7] slub: per cpu partial lists V4
On 8/13/11 9:28 PM, David Rientjes wrote:
> On Tue, 9 Aug 2011, Christoph Lameter wrote:
>
>> The following patchset introduces per cpu partial lists which allow
>> a performance increase of around ~10-20% with hackbench on my Sandybridge
>> processor.
>>
>> These lists help to avoid per node locking overhead. Allocator latency
>> could be further reduced by making these operations work without
>> disabling interrupts (like the fastpath and the free slowpath) but that
>> is another project.
>>
>> It is interesting to note that BSD has gone to a scheme with partial
>> pages only per cpu (source: Adrian). Transfer of cpu ownerships is
>> done using IPIs. Probably too much overhead for our taste. The approach
>> here keeps the per node partial lists essentially meaning the "pages"
>> in there have no cpu owner.
>>
>
> I'm currently 35,000 feet above Chicago going about 611 mph, so what
> better time to benchmark this patchset on my netperf testing rack!
>
> threads before after
> 16 78031 74714 (-4.3%)
> 32 118269 115810 (-2.1%)
> 48 150787 150165 (-0.4%)
> 64 189932 187766 (-1.1%)
> 80 221189 223682 (+1.1%)
> 96 239807 246222 (+2.7%)
> 112 262135 271329 (+3.5%)
> 128 273612 286782 (+4.8%)
> 144 280009 293943 (+5.0%)
> 160 285972 299798 (+4.8%)
>
> I'll review the patchset in detail, especially the cleanups and
> optimizations, when my wifi isn't so sketchy.

Andi, it'd be interesting to know your results for v4 of this patchset.
I'm hoping to get the patches reviewed and merged to linux-next this week.

Pekka


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