Re: Why do I sometimes "lose" the "psys" RAPL counter?

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(++Srinivas and the right(? other?) linux-pm mailing list)

On Thu, 26 Mar 2020, Zhang Rui wrote:

> what does "rdmsr 0x64D" return when there are 3 fixed counters?

$ sudo rdmsr 0x64D
56bcb63e
$ dmesg | fgrep RAPL
[    1.762354] RAPL PMU: API unit is 2^-32 Joules, 3 fixed counters, 655360 ms ovfl timer
[    1.762359] RAPL PMU: hw unit of domain pp0-core 2^-14 Joules
[    1.762363] RAPL PMU: hw unit of domain package 2^-14 Joules
[    1.762365] RAPL PMU: hw unit of domain pp1-gpu 2^-14 Joules
[    3.179900] intel_rapl_common: Found RAPL domain package
[    4.053170] intel_rapl_common: Found RAPL domain package
[    4.055152] intel_rapl_common: Found RAPL domain core
[    4.057066] intel_rapl_common: Found RAPL domain uncore
$

> if it returns 0, which I think it is the case, does reading the msr
> from other cpus return non-zero value, by using rdmsr -p parameter?

Well, it didn't, but why not?

CPU 0 MSR 0x64d value: 57a289a6
CPU 1 MSR 0x64d value: 57a28bf7
CPU 2 MSR 0x64d value: 57a28e15
CPU 3 MSR 0x64d value: 57a28f3b
CPU 4 MSR 0x64d value: 57a28fe8
CPU 5 MSR 0x64d value: 57a2912a
CPU 6 MSR 0x64d value: 57a2923d
CPU 7 MSR 0x64d value: 57a29327

> > > if that is not the problem, please attach the output of "grep .
> > > /sys/class/powercap/intel-rapl*/name" in both cases.

Here's the "3 counters case" (same running kernel as above):

$ sudo egrep -r . /sys/class/powercap/intel-rapl*/name
/sys/class/powercap/intel-rapl:0:0/name:core
/sys/class/powercap/intel-rapl:0:1/name:uncore
/sys/class/powercap/intel-rapl:0/name:package-0
/sys/class/powercap/intel-rapl-mmio:0/name:package-0
$

As soon as I get "4 counters" numbers I'll resend with those values.

	-Kenny

-- 
Kenneth R. Crudup  Sr. SW Engineer, Scott County Consulting, Silicon Valley



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