Messages in this thread | | | Date | Tue, 21 Jul 2015 21:32:24 +0200 | From | Peter Zijlstra <> | Subject | Re: perf: multiplexing broken on amd fam16h? |
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On Tue, Jul 21, 2015 at 02:14:54PM -0400, Vince Weaver wrote: > Hello > > I have a new AMD A8 system and perf multiplexing support is acting weird. > > If I run the perf_event_tests check_multiplexing test it fails like this: > > Event TotalCount RawCount Scale ScaledCount Error > 0 500282143 150403975 -2.00 (c8050b5 fffffffff9c224ef) -300807950 160.13% > > So the problem is that the TOTAL_TIME_RUNNING value is negative, which as > far as I know shouldn't be possible.
Correct, that should not happen. I don't have a Fam16 machine, but I can try and stare at the code a wee bit. Although there's another few perf issues I am still looking into as well :/
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