Messages in this thread | | | Date | Mon, 18 Sep 2006 10:46:58 -0400 | From | Mathieu Desnoyers <> | Subject | Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108 |
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Hi Jes,
* Jes Sorensen (jes@sgi.com) wrote: > Everything has performance limitations, you keep running around touting > that static is the only thing thats not a problem. Now show us the > numbers! >
If I may : I showed in a precedent thread that kprobes impact doubled LTTng's impact on the system. If you are interested in numbers about LTTng, here they are :
"The LTTng tracer : A Low Impact Performance and Behavior Monitor for GNU/Linux" (OLS2006) http://ltt.polymtl.ca/papers/desnoyers-ols2006.pdf
(and for Ingo : I haven't rerun the tests on your modified kprobes, it will come in time. But I do not really expect that 30-50 cycles compared to 1500 will make a very big difference.)
Mathieu
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