Hi, On 19/10/20 16:43, Vincent Guittot wrote: > On Mon, 19 Oct 2020 at 15:04, Marc Zyngier <m...@kernel.org> wrote: >> Since you are running perf, can you spot where the overhead occurs? > > hmm... Difficult to say because tracing the bench decreases a lot the > result. I have pasted the perf reports. >
<snip> > I have only put symbol with overhead above 1% > > so _raw_spin_unlock_irq, schedule and __schedule seem the most > impacted but i can't get any conclusion > AFAICT on TX2 you should be able to run these and get some more details within IRQ-disabled regions: https://lore.kernel.org/linux-arm-kernel/20200924110706.254996-1-alexandru.eli...@arm.com/ (they should be on linux-next) > I can sent you perf.data files if you want > > >> >> Thanks, >> >> M. >> -- >> Jazz is not dead. It just smells funny...
