Hi Srinivas, Thanks for your help. I was missing several needed patches. On 2020.08.02 11:39 Srinivas Pandruvada wrote: > On Sun, 2020-08-02 at 07:00 -0700, Doug Smythies wrote: > > On 2020.08.01 09:40 Srinivas Pandruvada wrote: > > > > On Monday, July 27, 2020 5:13:40 PM CEST Rafael J. Wysocki wrote: > > > > > On Thursday, July 16, 2020 7:37:04 PM CEST Rafael J. Wysocki > > > > > wrote: > > > > > > This really is a v2 of this patch: > > > > > > > > > > > > https://patchwork.kernel.org/patch/11663271/ > > > > > > > > > > > > with an extra preceding cleanup patch to avoid making > > > > > > unrelated > > > > > > changes in the > > > > > > [2/2]. > > > I applied this series along with > > > [PATCH] cpufreq: intel_pstate: Fix EPP setting via sysfs in active > > > mode > > > on 5.8 latest master (On top of raw epp patchset). > > > > Would you be kind enough to provide a "git log --oneline" output > > of what you did. > > 69dd9b2b11cd (HEAD -> 5-9-devel) cpufreq: intel_pstate: Implement > passive mode with HWP enabled > 63efaa01b06a cpufreq: intel_pstate: Fix EPP setting via sysfs in active > mode > e11e0a2edf83 cpufreq: intel_pstate: Rearrange the storing of new EPP > values > 93c3fd6a315c cpufreq: intel_pstate: Avoid enabling HWP if EPP is not > supported > 7cef1dd371c3 cpufreq: intel_pstate: Clean up aperf_mperf_shift > description > a3248d8d3a11 cpufreq: intel_pstate: Supply struct attribute description > for get_aperf_mperf_shift() > f52b6b075b07 cpufreq: intel_pstate: Fix static checker warning for epp > variable > 4a59d6be0774 cpufreq: intel_pstate: Allow raw energy performance > preference value > 7b34b5acdcc6 cpufreq: intel_pstate: Allow enable/disable energy > efficiency > ac3a0c847296 (origin/master, origin/HEAD, master) Merge > git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net > > > > I have been trying unsuccessfully to apply the patches, > > so somewhere I obviously missed something. > > > > > When intel_pstate=passive from kernel command line then it is fine, > > > no > > > crash. But switch dynamically, crashed: > > > > I'll try to repeat, if I can get an actual kernel. I could not repeat your crash. I tried booting with and without intel_pstate=passive on the kernel command line and then switching back and forth thereafter. However, I do confirm EPP is messed up. But not min and max from MSR 0x774, they behave as expected, based on quick testing only. Since you mentioned: >>> Don't have a recipe to reproduce this. Maybe I simply didn't hit whatever. ... Doug Useless additional stuff: # cat /proc/cmdline BOOT_IMAGE=/boot/vmlinuz-5.8.0-rc7-dssp root=UUID=0ac356c1-caa9-4c2e-8229-4408bd998dbd ro ipv6.disable=1 consoleblank=450 intel_pstate=passive cpuidle_sysfs_switch cpuidle.governor=teo Went "active" then "passive" and set ondemand governor. 2 X 100% CPU loads: # /home/doug/c/msr-decoder How many CPUs?: 6 8.) 0x198: IA32_PERF_STATUS : CPU 0-5 : 46 : 46 : 46 : 46 : 46 : 46 : B.) 0x770: IA32_PM_ENABLE: 1 : HWP enable 1.) 0x19C: IA32_THERM_STATUS: 883C0000 2.) 0x1AA: MSR_MISC_PWR_MGMT: 401CC0 EIST enabled Coordination enabled OOB Bit 8 reset OOB Bit 18 reset 3.) 0x1B1: IA32_PACKAGE_THERM_STATUS: 882D0000 4.) 0x64F: MSR_CORE_PERF_LIMIT_REASONS: 0 A.) 0x1FC: MSR_POWER_CTL: 3C005D : C1E disable : EEO disable : RHO disable 5.) 0x771: IA32_HWP_CAPABILITIES (performance): 10B252E : high 46 : guaranteed 37 : efficient 11 : lowest 1 6.) 0x774: IA32_HWP_REQUEST: CPU 0-5 : raw: FF002E0A : FF002E2E : FF002E2E : FF002E08 : FF002E18 : FF002E08 : min: 10 : 46 : 46 : 8 : 24 : 8 : max: 46 : 46 : 46 : 46 : 46 : 46 : des: 0 : 0 : 0 : 0 : 0 : 0 : epp: 255 : 255 : 255 : 255 : 255 : 255 : act: 0 : 0 : 0 : 0 : 0 : 0 : 7.) 0x777: IA32_HWP_STATUS: 4 : high 4 : guaranteed 0 : efficient 0 : lowest 0 Kernel: d72c8472dbd5 (HEAD -> k58rc7-d3) cpufreq: intel_pstate: Fix EPP setting via sysfs in active mode c2f4869fbc27 cpufreq: intel_pstate: Implement passive mode with HWP enabled 85219968fab9 cpufreq: intel_pstate: Rearrange the storing of new EPP values 5c09a1a38106 cpufreq: intel_pstate: Avoid enabling HWP if EPP is not supported 9f29c81fe0b3 cpufreq: intel_pstate: Clean up aperf_mperf_shift description 2a863c241495 cpufreq: intel_pstate: Supply struct attribute description for get_aperf_mperf_shift() 4180d8413037 cpufreq: intel_pstate: Fix static checker warning for epp variable 7cd50e86a9e6 cpufreq: intel_pstate: Allow raw energy performance preference value 56dce9a1081e cpufreq: intel_pstate: Allow enable/disable energy efficiency 92ed30191993 (tag: v5.8-rc7) Linux 5.8-rc7
