Monitoring actual current CPU frequency in guest OS
-
I have installed XCP-ng 8.2.1 on some testing HW (Lenovo SR650). I created Ubuntu 20.04 VM on it and am running some performance tests.
I am able to monitor CPU frequency in Hypervisor via xenpm command:
[13:50 test-xcp-ng ~]# xenpm get-cpufreq-average | grep 'frequency: ' average cpu frequency: 1134540 average cpu frequency: 2227060 average cpu frequency: 1449690 average cpu frequency: 2248070 average cpu frequency: 1428680 average cpu frequency: 1869890 average cpu frequency: 2143020 average cpu frequency: 1764840 average cpu frequency: 2290090 average cpu frequency: 1554740 average cpu frequency: 2584230 average cpu frequency: 1050500 average cpu frequency: 2206050 average cpu frequency: 1071510 average cpu frequency: 1890900 average cpu frequency: 1050500 average cpu frequency: 1134540 average cpu frequency: 1113530 average cpu frequency: 1113530 average cpu frequency: 1092520 average cpu frequency: 1113530 average cpu frequency: 1113530 average cpu frequency: 1134540 average cpu frequency: 1092520 average cpu frequency: 1113530 average cpu frequency: 1113530 average cpu frequency: 1155550 average cpu frequency: 1134540 average cpu frequency: 1155550 average cpu frequency: 1155550 average cpu frequency: 1176560 average cpu frequency: 1176560But
/proc/cpuinfoin Ubuntu VM shows only fixed CPU frequency:root@test-vm:~# cat /proc/cpuinfo | grep -i mhz cpu MHz : 2095.211 cpu MHz : 2095.211 cpu MHz : 2095.211 cpu MHz : 2095.211Adding also
lscpuoutput (again same MHz as above):root@test-vm:~# lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian Address sizes: 46 bits physical, 48 bits virtual CPU(s): 4 On-line CPU(s) list: 0-3 Thread(s) per core: 1 Core(s) per socket: 1 Socket(s): 4 NUMA node(s): 1 Vendor ID: GenuineIntel CPU family: 6 Model: 85 Model name: Intel(R) Xeon(R) Silver 4216 CPU @ 2.10GHz Stepping: 7 CPU MHz: 2095.211 BogoMIPS: 4190.29 Hypervisor vendor: Xen Virtualization type: full L1d cache: 128 KiB L1i cache: 128 KiB L2 cache: 4 MiB L3 cache: 88 MiB NUMA node0 CPU(s): 0-3 Vulnerability Itlb multihit: KVM: Vulnerable Vulnerability L1tf: Mitigation; PTE Inversion Vulnerability Mds: Mitigation; Clear CPU buffers; SMT Host state unknown Vulnerability Meltdown: Mitigation; PTI Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl and seccomp Vulnerability Spectre v1: Mitigation; usercopy/swapgs barriers and __user pointer sanitization Vulnerability Spectre v2: Mitigation; Retpolines, IBPB conditional, IBRS_FW, STIBP disabled, RSB filling Vulnerability Srbds: Not affected Vulnerability Tsx async abort: Not affected Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush acpi mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl cpuid pni pclmulqdq sss e3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch cpuid_fault invpcid_single pti intel_ppin ssbd ibrs ibp b stibp fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx rdseed adx smap clflushopt clwb xsaveopt xsavec xgetbv1 xsaves pku ospke md_clear flush_l1dIn some cloud providers (e.g. AWS EC2), CPU frequency that is visible in
/proc/cpuinfolooks like current CPU frequency (looks "live" - changing on every run):root@aws-instance:~# cat /proc/cpuinfo | grep -i mhz cpu MHz : 3499.906 cpu MHz : 3500.627 cpu MHz : 3499.477 cpu MHz : 3501.732 cpu MHz : 3499.307 cpu MHz : 3499.868 cpu MHz : 3500.009 cpu MHz : 3499.829 root@aws-instance:~# cat /proc/cpuinfo | grep -i mhz cpu MHz : 3500.867 cpu MHz : 3500.318 cpu MHz : 3500.907 cpu MHz : 3499.985 cpu MHz : 3500.236 cpu MHz : 3500.225 cpu MHz : 3499.921 cpu MHz : 3501.104 root@aws-instance:~# cat /proc/cpuinfo | grep -i mhz cpu MHz : 3500.423 cpu MHz : 3500.150 cpu MHz : 3500.372 cpu MHz : 3500.026 cpu MHz : 3501.071 cpu MHz : 3500.911 cpu MHz : 3500.316 cpu MHz : 3500.048I would like to monitor current CPU frequency in my Ubuntu VM that is running in XCP-ng hypervisor, similar to what I can see in AWS EC2 instance. Is that possible?