On Mon, May 28, 2018 at 12:12:34PM +0200, Juri Lelli wrote: [..] > > + > > + util = max_t(unsigned long, util, READ_ONCE(rq->avg_dl.util_avg)); > > + > > + return util; > > Anyway, just a quick thought. I guess we should experiment with this a > bit. Now, I don't unfortunately have a Arm platform at hand for testing. > Claudio, Luca (now Cc-ed), would you be able to fire some tests with > this change? > > Oh, adding Joel and Alessio as well that experimented with DEADLINE > lately.
I also feel that for power reasons, dl.util_avg shouldn't drive the OPP beyond what the running bandwidth is, or atleast do that only if CFS tasks are running and being preempted as you/Vincent mentioned in one of the threads. With our DL experiments, I didn't measure power but got it to a point where the OPP is scaling correctly based on DL parameters. I think Alessio did measure power at his setup but I can't recall now. Alessio? thanks, - Joel