linux-kernel - Re: [this_cpu_xx V6 7/7] this_cpu: slub aggressive use of this

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Message-ID: <alpine.DEB.1.00.0910130231570.27262@chino.kir.corp.google.com>
Date:	Tue, 13 Oct 2009 02:45:56 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
cc:	Tejun Heo <tj@...nel.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Mel Gorman <mel@....ul.ie>,
	Zhang Yanmin <yanmin_zhang@...ux.intel.com>
Subject: Re: [this_cpu_xx V6 7/7] this_cpu: slub aggressive use of this_cpu
 operations in the hotpaths

On Mon, 12 Oct 2009, Pekka Enberg wrote:

> The patch looks sane to me but the changelog contains no relevant
> numbers on performance. I am fine with the patch going in -percpu but
> the patch probably needs some more beating performance-wise before it
> can go into .33. I'm CC'ing some more people who are known to do SLAB
> performance testing just in case they're interested in looking at the
> patch. In any case,
> 

I ran 60-second netperf TCP_RR benchmarks with various thread counts over 
two machines, both four quad-core Opterons.  I ran the trials ten times 
each with both vanilla per-cpu#for-next at 9288f99 and with v6 of this 
patchset.  The transfer rates were virtually identical showing no 
improvement or regression with this patchset in this benchmark.

 [ As I reported in http://marc.info/?l=linux-kernel&m=123839191416472, 
   this benchmark continues to be the most significant regression slub has 
   compared to slab. ]
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