16.06.2021 11:30, Vincent Guittot пишет: > On Wed, 16 Jun 2021 at 10:03, Viresh Kumar <viresh.kumar@xxxxxxxxxx> wrote: >> >> +Vincent. >> >> On 15-06-21, 22:32, Dmitry Osipenko wrote: >>> IIUC, the cpufreq already should be prepared for the case where firmware >>> may override frequency. Viresh, could you please clarify what are the >>> possible implications of the frequency overriding? >> >> The only implication is software would think hardware is running at >> some other frequency, while it is not. Not sure if something may break >> as a result of this. >> >> The scheduler's view of CPUs will not be same though, i.e. scheduler >> will see capacity as X, while in reality it has changed to Y. > > thermal_pressure is used by scheduler to balance the load between CPUs > according to the actual max frequency. If the thermal pressure doesn't > reflect reality, scheduler will end up enqueuing too many tasks on a > throttle CPU. What if all CPUs are throttled equally and running on the same frequency, will throttling have any effect on the scheduler decisions?
