On Tue, Mar 22, 2016 at 11:14:49AM -0700, Ganesh Ajjanagadde wrote: > > Are you sure that this speedup (and the other patch you posted) is real and > > above the error? Did you do multiple runs to rule out that it was chance? > > 0.04/0.05 second improvement on 5 seconds doesn't seem significant at all, > > I am really sorry about these measurements, they were screwed up by a > very recent regression on my laptop due to some package upgrade. > Essentially, put it to suspend, restore, and the clock freq/cpu > governor would downshift slightly, from 2.4 to 2.2 GHz base, no idea > about the changes to the turbo freq.
To benchmark really properly it is best to force the CPU to a fixed frequency. Otherwise you might end up benchmarking your CPU frequency governor instead of your code. It usually works fine without, but if the difference gets below 1% it generally becomes a must to do so. _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
