2016-03-29 23:34 GMT+02:00 Rafael J. Wysocki <r...@rjwysocki.net>: > On Tuesday, March 29, 2016 07:32:27 PM Jörg Otte wrote: >> 2016-03-29 19:24 GMT+02:00 Jörg Otte <jrg.o...@gmail.com>: >> > in v4.5 and earlier intel-pstate downscaled idle processors (load >> > 0.1-0.2%) to minumum frequency, in my case 800MHz. >> > >> > Now in v4.6-rc1 the characteristic has dramatically changed. If in >> > idle the processor frequency is more or less a few MHz around 2500Mhz. >> > This is the maximum non turbo frequency. >> > >> > No difference between powersafe or performance governor. >> > >> > I currently use acpi_cpufreq which works as usual. >> > >> > Processor: >> > Intel(R) Core(TM) i5-4200M CPU @ 2.50GHz (family: 0x6, model: 0x3c, >> > stepping: 0x3) >> > >> > Last known good kernel is: 4.5.0-01127-g9256d5a >> > First known bad kernel is: 4.5.0-02535-g09fd671 >> > >> > There is >> > commit 277edba Merge tag 'pm+acpi-4.6-rc1-1' of >> > git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm >> > in between, which brought a few changes in intel_pstate. > > Can you please check commit a4675fbc4a7a (cpufreq: intel_pstate: Replace > timers > with utilization update callbacks)? > Yes , this solved the problem for me. I had to resolve some conflicts myself when reverting that commit. Hard work :).
Here is a 10-seconds trace of the used frequencies when in "desktop-idle": driver cpu0 cpu1 cpu2 cpu3 ------------------------------------- intel_pstate ( 800 928 941 1200) MHz load:( 0.2)% intel_pstate ( 800 928 1181 1800) MHz load:( 0.0)% intel_pstate ( 1675 1576 1347 800) MHz load:( 0.0)% intel_pstate ( 1198 1576 842 800) MHz load:( 0.5)% intel_pstate ( 800 1181 1113 1600) MHz load:( 0.0)% intel_pstate ( 808 1181 805 800) MHz load:( 0.5)% intel_pstate ( 844 1191 900 1082) MHz load:( 0.3)% intel_pstate ( 816 1191 800 800) MHz load:( 0.0)% intel_pstate ( 800 905 892 1082) MHz load:( 0.2)% intel_pstate ( 945 905 1340 800) MHz load:( 0.3)% Thanks, Jörg
