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

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On Wed, 2020-03-25 at 23:59 -0700, Kenneth R. Crudup wrote:
> On Thu, 26 Mar 2020, Zhang Rui wrote:
> 
> > According to the dmesg below, I don't think it is the psys domain
> > that
> > is missing.
> 
> Yeah, take another look (and I've re-attached the dmesg excerpts). I
> will
> always get the domains "pp0-core", "package" and "pp1-gpu" and "fixed
> counters" reports 3, but every now and then I get an additional
> domain
> "psys" (and a "fixed counters" report of 4).

yeah, you're right.
what does "rdmsr 0x64D" return when there are 3 fixed counters?
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? 

> 
> > One possibility is that you're switching between different kernels,
> > and
> > one kernel is built with CONFIG_PROC_THERMAL_MMIO_RAPL set, and one
> > is
> > not. can you make a double check?
> 
> Nah, that's not the case. I only pull forward from Linus' tree and
> have
> always included that config option.
> 
> What is relevant is I *think* (and can verify later) that I get the
> "psys" domain on a cold boot from power off, but not if I reboot.

yeah. it is good to compare the "rdmsr 0x64d" output in both cases.

tthanks,
rui
> 
> > if that is not the problem, please attach the output of "grep .
> > /sys/class/powercap/intel-rapl*/name" in both cases.
> 
> OK, I'll do that in the morning and get back to you.
> 
> 	-Kenny
> 




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