* Vaidyanathan Srinivasan <svaidy@xxxxxxxxxxxxxxxxxx> wrote: > I will watch this during the experiments. I have been using klog > application to dump relayfs data. I did run powertop and top as well, > I will bind them to certain CPUs and isolate their impact. > > I believe the margin of error would be less since all the measurement > tasks sleep for long duration. ok, long duration ought to be enough. i think a possible explanation of your observtions would be this: sleepy workloads are affected more by the wakeup logic, and most of the power-savings works via runtime balancing. So perhaps try to add some SD_POWERSAVINGS_BALANCE logic to try_to_wake_up()? I think waking up on the same CPU where it went to sleep is the most power-efficient approach in general. (or always waking up where the wakee runs - this should be measured.) Right now try_to_wake_up() tries to spread out load opportunistically, which is throughput-maximizing but it's arguably not very power conscious. Ingo _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
