On Tue, 16 Mar 2021, Adam Borowski wrote: > On Tue, Mar 16, 2021 at 04:45:02PM +0100, Jiri Olsa wrote: > > hi, > > when running 'perf top' on AMD Rome (/proc/cpuinfo below) > > with fedora 33 kernel 5.10.22-200.fc33.x86_64 > > > > we got unknown NMI messages: > > > > [ 226.700160] Uhhuh. NMI received for unknown reason 3d on CPU 90. > > [ 226.700162] Do you have a strange power saving mode enabled? > > [ 226.700163] Dazed and confused, but trying to continue > > > > also when discussing ths with Borislav, he managed to reproduce easily > > on his AMD Rome machine > > Likewise, 3c on Pinnacle Ridge.
I've also seen it on Renoir, and it appears related to PMU interrupt racing against C-state entry/exit. Disabling C2 and C3 via 'cpupower' is enough to avoid those NMIs in my case. IIRC there were a few patches related to this area from AMD in the past. Alexander
