On Tue, Aug 6, 2019 at 1:19 PM Harald Geyer <harald@xxxxxxxxx> wrote: > > Vasily Khoruzhick writes: > > On Tue, Aug 6, 2019 at 7:35 AM Robin Murphy <robin.murphy@xxxxxxx> wrote: > > > > > > On 06/08/2019 15:01, Vasily Khoruzhick wrote: > > > > Looks like PMU in A64 is broken, it generates no interrupts at all and > > > > as result 'perf top' shows no events. > > > > > > Does something like 'perf stat sleep 1' at least count cycles correctly? > > > It could well just be that the interrupt numbers are wrong... > > > > Looks like it does, at least result looks plausible: > > I'm using perf stat regularly (cache benchmarks) and it works fine. > > Unfortunately I wasn't aware that perf stat is a poor test for > the interrupts part of the node, when I added it. So I'm not too > surprised I got it wrong. > > However, it would be unfortunate if the node got removed completely, > because perf stat would not work anymore. Maybe we can only remove > the interrupts or just fix them even if the HW doesn't work? I'm not familiar with PMU driver. Is it possible to get it working without interrupts? > > Harald
