Agreed that this is an issue with acpi-cpufreq. turbostat is broken on Trusty: $ sudo turbostat /dev/cpu/0/msr offset 0x641 read failed
But using Brendan Gregg's msr-cloud-tools [1] it seems we are actually running at max frequency (with intel_idle.max_cstate=0 processor.max_cstate=0 but without intel_pstate): $ sudo ./showboost CPU MHz : 2901 Turbo MHz : 3200 (10 active) Turbo Ratio : 110% (10 active) CPU 0 summary every 5 seconds... TIME C0_MCYC C0_ACYC UTIL RATIO MHz 09:04:00 6554116 7236499 0% 110% 3203 09:04:05 4712681 5202133 0% 110% 3202 09:04:10 4209132 4646582 0% 110% 3202 09:04:15 4560950 5038256 0% 110% 3204 While cpupower still shows us running at 2901: $ sudo cpupower frequency-info analyzing CPU 0: driver: acpi-cpufreq CPUs which run at the same hardware frequency: 0 CPUs which need to have their frequency coordinated by software: 0 maximum transition latency: 10.0 us. hardware limits: 1.20 GHz - 2.90 GHz available frequency steps: 2.90 GHz, 2.90 GHz, 2.80 GHz, 2.70 GHz, 2.50 GHz, 2.40 GHz, 2.30 GHz, 2.20 GHz, 2.00 GHz, 1.90 GHz, 1.80 GHz, 1.70 GHz, 1.60 GHz, 1.40 GHz, 1.30 GHz, 1.20 GHz available cpufreq governors: conservative, ondemand, userspace, powersave, performance current policy: frequency should be within 1.20 GHz and 2.90 GHz. The governor "performance" may decide which speed to use within this range. current CPU frequency is 2.90 GHz (asserted by call to hardware). cpufreq stats: 2.90 GHz:100.00%, 2.90 GHz:0.00%, 2.80 GHz:0.00%, 2.70 GHz:0.00%, 2.50 GHz:0.00%, 2.40 GHz:0.00%, 2.30 GHz:0.00%, 2.20 GHz:0.00%, 2.00 GHz:0.00%, 1.90 GHz:0.00%, 1.80 GHz:0.00%, 1.70 GHz:0.00%, 1.60 GHz:0.00%, 1.40 GHz:0.00%, 1.30 GHz:0.00%, 1.20 GHz:0.00% boost state support: Supported: yes Active: yes [1] https://github.com/brendangregg/msr-cloud-tools -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1477171 Title: Enable intel_pstate by default on Trusty EC2 AMIs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1477171/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs