Messages in this thread | | | Date | Wed, 23 Apr 2014 17:09:12 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH] perf/x86/intel: Use rdmsrl_safe when initializing RAPL PMU. |
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On Wed, Apr 23, 2014 at 04:49:55PM +0200, Stephane Eranian wrote: > On your machine, booted with 3.15-rc2, do you have /sys/devices/power? > If not, and you have at least an SNB, you should have RAPL and that > RAPL_UNIT MSR. > > Proof is that if you read that MSR using /dev/cpu/msr it works just fine: > # modprobe msr > # rdmsr 0x606 > a1003 > > So something is broken somewhere.
I've not got SNB+ class hardware (for testing). But I believe you that there's something funny, I just do not understanding how *msr_safe() could cause this.
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