Messages in this thread | | | Subject | Re: [PATCH v1 0/5] CPUFREQ OPP's and Tegra30 support by tegra20-cpufreq driver | From | Dmitry Osipenko <> | Date | Fri, 14 Sep 2018 13:30:13 +0300 |
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On 9/11/18 11:27 AM, Marcel Ziswiler wrote: > On Fri, 2018-09-07 at 19:59 +0300, Dmitry Osipenko wrote: > > - snip - > >>> - With "cpufreq-info -f" I could only observe like the top 3-4 OPPs >>> while it does not to go further down even when idling. Why could >>> that >>> be resp. what could cause this? >> >> What cpufreq governor are you using? > > ondemand > >> Here is my 'cpufreq-info --stats' output from Tegra30 after a several >> minutes of idling after boot: >> >> 408000:245884, 456000:445, 608000:251, 760000:151, 816000:82, >> 912000:75, 1000000:163 (561) >> >> And full cpufreq-info: >> >> cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009 >> Report errors and bugs to cpufreq@vger.kernel.org, please. >> analyzing CPU 0: >> driver: tegra >> CPUs which run at the same hardware frequency: 0 1 2 3 >> CPUs which need to have their frequency coordinated by software: 0 >> 1 2 3 >> maximum transition latency: 50.0 us. >> hardware limits: 408 MHz - 1000 MHz >> available frequency steps: 408 MHz, 456 MHz, 608 MHz, 760 MHz, 816 >> MHz, 912 MHz, 1000 MHz >> available cpufreq governors: conservative, userspace, powersave, >> ondemand, performance, schedutil >> current policy: frequency should be within 408 MHz and 1000 MHz. >> The governor "ondemand" may decide which speed to >> use >> within this range. >> current CPU frequency is 608 MHz (asserted by call to hardware). >> cpufreq stats: 408 MHz:99.53%, 456 MHz:0.18%, 608 MHz:0.10%, 760 >> MHz:0.06%, 816 MHz:0.03%, 912 MHz:0.03%, 1000 MHz:0.07% (563) >> analyzing CPU 1: >> driver: tegra >> CPUs which run at the same hardware frequency: 0 1 2 3 >> CPUs which need to have their frequency coordinated by software: 0 >> 1 2 3 >> maximum transition latency: 50.0 us. >> hardware limits: 408 MHz - 1000 MHz >> available frequency steps: 408 MHz, 456 MHz, 608 MHz, 760 MHz, 816 >> MHz, 912 MHz, 1000 MHz >> available cpufreq governors: conservative, userspace, powersave, >> ondemand, performance, schedutil >> current policy: frequency should be within 408 MHz and 1000 MHz. >> The governor "ondemand" may decide which speed to >> use >> within this range. >> current CPU frequency is 608 MHz (asserted by call to hardware). >> cpufreq stats: 408 MHz:99.53%, 456 MHz:0.18%, 608 MHz:0.10%, 760 >> MHz:0.06%, 816 MHz:0.03%, 912 MHz:0.03%, 1000 MHz:0.07% (563) >> analyzing CPU 2: >> driver: tegra >> CPUs which run at the same hardware frequency: 0 1 2 3 >> CPUs which need to have their frequency coordinated by software: 0 >> 1 2 3 >> maximum transition latency: 50.0 us. >> hardware limits: 408 MHz - 1000 MHz >> available frequency steps: 408 MHz, 456 MHz, 608 MHz, 760 MHz, 816 >> MHz, 912 MHz, 1000 MHz >> available cpufreq governors: conservative, userspace, powersave, >> ondemand, performance, schedutil >> current policy: frequency should be within 408 MHz and 1000 MHz. >> The governor "ondemand" may decide which speed to >> use >> within this range. >> current CPU frequency is 608 MHz (asserted by call to hardware). >> cpufreq stats: 408 MHz:99.53%, 456 MHz:0.18%, 608 MHz:0.10%, 760 >> MHz:0.06%, 816 MHz:0.03%, 912 MHz:0.03%, 1000 MHz:0.07% (563) >> analyzing CPU 3: >> driver: tegra >> CPUs which run at the same hardware frequency: 0 1 2 3 >> CPUs which need to have their frequency coordinated by software: 0 >> 1 2 3 >> maximum transition latency: 50.0 us. >> hardware limits: 408 MHz - 1000 MHz >> available frequency steps: 408 MHz, 456 MHz, 608 MHz, 760 MHz, 816 >> MHz, 912 MHz, 1000 MHz >> available cpufreq governors: conservative, userspace, powersave, >> ondemand, performance, schedutil >> current policy: frequency should be within 408 MHz and 1000 MHz. >> The governor "ondemand" may decide which speed to >> use >> within this range. >> current CPU frequency is 608 MHz (asserted by call to hardware). >> cpufreq stats: 408 MHz:99.53%, 456 MHz:0.18%, 608 MHz:0.10%, 760 >> MHz:0.06%, 816 MHz:0.03%, 912 MHz:0.03%, 1000 MHz:0.07% (563) >> >> >>> - Unfortunately "cpufreq-info --stats" currently does not seem to >>> output anything. Would that require something special to be >>> implemented? >> >> Make sure that CONFIG_CPU_FREQ_STAT is enabled in the kernels config. > > Yes, sorry. That was it, of course. Just wondering why that one isn't > enabled in tegra_defconfig...
That option isn't essential for the kernel, though usually such useful and low-overhead features are welcome. IIRC, tegra_defconfig misses more important options (like namespaces) that are required by Linux distro's to work properly.
>>> Other than that you may add the following to the whole series: >>> >>> Tested-by: Marcel Ziswiler <marcel.ziswiler@toradex.com> >> >> Thank you very much! > > You are very welcome. Thank you! >
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