On 05/06/18 16:18, Peter Zijlstra wrote: > On Mon, Jun 04, 2018 at 08:08:58PM +0200, Vincent Guittot wrote:
[...] > > As you mentioned, scale_rt_capacity give the remaining capacity for > > cfs and it will behave like cfs util_avg now that it uses PELT. So as > > long as cfs util_avg < scale_rt_capacity(we probably need a margin) > > we keep using dl bandwidth + cfs util_avg + rt util_avg for selecting > > OPP because we have remaining spare capacity but if cfs util_avg == > > scale_rt_capacity, we make sure to use max OPP. > > Good point, when cfs-util < cfs-cap then there is idle time and the util > number is 'right', when cfs-util == cfs-cap we're overcommitted and > should go max. > > Since the util and cap values are aligned that should track nicely. Yeah. Makes sense to me as well. :)
