Re: [this_cpu_xx V6 7/7] this_cpu: slub aggressive use of this_cpuoperations in the hotpaths

[David Rientjes]

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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