Re: [slub p2 0/4] SLUB: [RFC] Per cpu partial lists V2

From: Christoph Lameter
Date: Mon Jun 20 2011 - 16:01:29 EST

On Mon, 20 Jun 2011, Andi Kleen wrote:

> On Mon, Jun 20, 2011 at 10:32:44AM -0500, Christoph Lameter wrote:
> > The following patchset applied on top of the lockless patchset V7. It
> > introduces per cpu partial lists which allow a performance increase of
> > around ~15 during contention for the nodelock (can be tested using
> > hackbench).
> What size system did you test it on?

Sandybridge 4 core (8 cpus) 8G Ram.

> > These lists help to avoid per nodelocking overhead. Allocator latency
> > could be further reduced by making these operations work without
> > disabling interrupts (like the fastpath and the free slowpath) as well as
> > implementing better ways of handling ther cpu array with partial pages.
> I think we really need better batching for the transfers.

Could you elaborate on that cryptic remark?

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