2016-09-29 17:11 GMT+02:00 Armin Rigo <ar...@tunes.org>: > On my laptop, the speed ranges between 500MHz and 2300MHz.
Oh I see, on this computer the difference can be up to 5x slower! >> * (Use NOHZ_FULL but) Force frequency to the maximum >> * Don't use NOHZ_FULL > > I think we should force the frequency to a single number which is the > maximum that can be reasonably sustained In my experience, the CPU is fine when running at the nominal speed. I'm talking about the value displayed in the CPU model in /cpu/cpuinfo (2.9 GHz): $ grep 'model name' /proc/cpuinfo model name : Intel(R) Core(TM) i7-3520M CPU @ 2.90GHz > (I mean, not the overclocked speed done by some CPUs for short amounts of > time). This is the Turbo Mode. It can be disabled in the BIOS or by writing 1 into /sys/devices/system/cpu/intel_pstate/no_turbo By the way, the most reliable tool that I found to read the CPU frequency is turbostat. I used APERF and MPERF counters to compute the "Busy MHz". You may also try "cpupower monitor" which is similar. Victor _______________________________________________ Speed mailing list Speed@python.org https://mail.python.org/mailman/listinfo/speed
