Messages in this thread | | | Date | Mon, 09 Jul 2007 08:59:25 -0700 | From | Martin Bligh <> | Subject | Re: [patch 00/10] [RFC] SLUB patches for more functionality, performance and maintenance |
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Christoph Lameter wrote: > On Sun, 8 Jul 2007, Andi Kleen wrote: > >> Christoph Lameter <clameter@sgi.com> writes: >> >>> A cmpxchg is less costly than interrupt enabe/disable >> That sounds wrong. > > Martin Bligh was able to significantly increase his LTTng performance > by using cmpxchg. See his article in the 2007 proceedings of the OLS > Volume 1, page 39. > > His numbers were: > > interrupts enable disable : 210.6ns > local cmpxchg : 9.0ns
Those numbers came from Mathieu Desnoyers (LTTng) if you want more details.
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