* Vaidyanathan Srinivasan <[EMAIL PROTECTED]> 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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
