On 28/05/18 22:08, Joel Fernandes wrote: > 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.
It's however a bit awkward that we might be running at a higher OPP when CFS tasks are running (even though they are of less priority). :/ > 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? I see. Thanks.