linux-kernel - Re: [slub p4 0/7] slub: per cpu partial lists V4

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Date:	Mon, 15 Aug 2011 09:29:42 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	David Rientjes <rientjes@...gle.com>
cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Andi Kleen <andi@...stfloor.org>, 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 p4 0/7] slub: per cpu partial lists V4

On Sat, 13 Aug 2011, David Rientjes wrote:

> 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%)

The higher the contention the better the performance. But the -4% on non
contention is worrisome.
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