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 >
