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Date: Mon, 20 Jun 2011 15:01:21 -0500 (CDT)
From: Christoph Lameter <cl@linux.com>
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To: Andi Kleen <andi@firstfloor.org>
cc: Pekka Enberg <penberg@cs.helsinki.fi>,
        David Rientjes <rientjes@google.com>, tj@kernel.org,
        Metathronius Galabant <m.galabant@googlemail.com>,
        Matt Mackall <mpm@selenic.com>, Eric Dumazet <eric.dumazet@gmail.com>,
        Adrian Drzewiecki <z@drze.net>, linux-kernel@vger.kernel.org
Subject: Re: [slub p2 0/4] SLUB: [RFC] Per cpu partial lists V2
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References: <20110620153244.214038140@linux.com> <20110620194236.GA32765@one.firstfloor.org>
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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?