[lttng-dev] major variations in perfomance figures

Wolfgang Rostek wolfgang.rostek at gmx.de
Fri Apr 3 11:34:44 EDT 2015

> > Frequence scaling I can't imagine on my dektop machine.
> > It is a jump between 350ns and 800ns. In the loop below
> > all the events of one test run are of equal time distance,
> > either slow or fast.
> Frequency scaling can still definitely play a role, even on a desktop machine.
> Also, Core i5 chips support Turbo Boost which should be disabled to
> perform benchmarks.
> I'm guessing you get your time measurements from the timestamps in the
> trace?

I'm not hunting for a detailed benchmark. Only such a large variance makes
me thoughtful. For such a test I did expect some 10-30% but not this more 
than 200%.

Wolfgang R.

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