On 3/16/21 2:53 PM, Peter Zijlstra 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 >> [ 226.769565] Uhhuh. NMI received for unknown reason 3d on CPU 84. >> [ 226.769566] Do you have a strange power saving mode enabled? >> [ 226.769567] Dazed and confused, but trying to continue >> [ 226.769771] Uhhuh. NMI received for unknown reason 2d on CPU 24. >> [ 226.769773] Do you have a strange power saving mode enabled? >> [ 226.769774] Dazed and confused, but trying to continue >> [ 226.812844] Uhhuh. NMI received for unknown reason 2d on CPU 23. >> [ 226.812846] Do you have a strange power saving mode enabled? >> [ 226.812847] Dazed and confused, but trying to continue >> [ 226.893783] Uhhuh. NMI received for unknown reason 2d on CPU 27. >> [ 226.893785] Do you have a strange power saving mode enabled? >> [ 226.893786] Dazed and confused, but trying to continue >> [ 226.900139] Uhhuh. NMI received for unknown reason 2d on CPU 40. >> [ 226.900141] Do you have a strange power saving mode enabled? >> [ 226.900143] Dazed and confused, but trying to continue >> [ 226.908763] Uhhuh. NMI received for unknown reason 3d on CPU 120. >> [ 226.908765] Do you have a strange power saving mode enabled? >> [ 226.908766] Dazed and confused, but trying to continue >> [ 227.751296] Uhhuh. NMI received for unknown reason 2d on CPU 83. >> [ 227.751298] Do you have a strange power saving mode enabled? >> [ 227.751299] Dazed and confused, but trying to continue >> [ 227.752937] Uhhuh. NMI received for unknown reason 3d on CPU 23. >> >> also when discussing ths with Borislav, he managed to reproduce easily >> on his AMD Rome machine >> >> any idea? > > Kim is the AMD point person for this I think..
Since perf top invokes precision and therefore IBS, this looks like it's hitting erratum #1215: https://developer.amd.com/wp-content/resources/56323-PUB_0.78.pdf Kim
