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

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Message-ID: <alpine.DEB.2.00.1106201459390.17524@router.home>
Date:	Mon, 20 Jun 2011 15:01:21 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Andi Kleen <andi@...stfloor.org>
cc:	Pekka Enberg <penberg@...helsinki.fi>,
	David Rientjes <rientjes@...gle.com>, tj@...nel.org,
	Metathronius Galabant <m.galabant@...glemail.com>,
	Matt Mackall <mpm@...enic.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Adrian Drzewiecki <z@...e.net>, linux-kernel@...r.kernel.org
Subject: Re: [slub p2 0/4] SLUB: [RFC] Per cpu partial lists V2

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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