linux-kernel - Re: [GIT PULL] SLAB changes for v3.1-rc0

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Message-ID: <alpine.DEB.2.00.1107291023000.16178@router.home>
Date:	Fri, 29 Jul 2011 10:24:45 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	David Rientjes <rientjes@...gle.com>
cc:	Pekka Enberg <penberg@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [GIT PULL] SLAB changes for v3.1-rc0

On Thu, 28 Jul 2011, David Rientjes wrote:

> On Thu, 28 Jul 2011, Pekka Enberg wrote:
>
> > Christoph, your debugging fix has been in linux-next for few days now
> > and no problem have been reported. I'm considering sending the series
> > to Linus. What do you think?
> >
>
> I ran slub/lockless through some stress testing and it seems to be quite
> stable on my testing cluster.  There is about a 2.3% performance
> improvement with the lockless slowpath on the netperf benchmark with
> various thread counts on my 16-core 64GB Opterons, so I'd recommend it to
> be merged into 3.1.

Great. Could you also test the next stage of patches (not yet even in
Pekka's tree) where we add a per cpu cache of partial allocated slab
pages? This decreases the per node lock contention further. I can repost
the set if the old one does not work for you. Shows significant
improvement here as well.



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