Christoph Lameter wrote:
On Sun, 8 Jul 2007, Andi Kleen wrote:
Christoph Lameter <[email protected]> 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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