Messages in this thread | | | From | Vince Weaver <> | Date | Fri, 17 Jun 2016 11:54:22 -0400 (EDT) | Subject | Re: [REDO PATCH v7] perf/x86/amd/power: Add AMD accumulated power reporting mechanism |
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On Fri, 17 Jun 2016, Huang Rui wrote:
> Can you try to read the MSR value two times with the same core > (rdmsrl_on_cpu)?
I'm reading from userspace using the /dev/cpu/0/msr device so it should always be reading from cpu0.
I guess I could code up a custom kernel module to debug this if necessary.
It does look that for some reason the 0xc0010280 MSR is only returning the lower 24 bits of the PTSC, rather than the 40 bits that cpuid 80000008:ecx seems to think it should have.
Vince
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