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Message-ID: <alpine.DEB.2.22.394.2110241452460.2997@hadrien> Date: Sun, 24 Oct 2021 15:02:58 +0200 (CEST) From: Julia Lawall <julia.lawall@...ia.fr> To: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>, Len Brown <lenb@...nel.org>, "Rafael J. Wysocki" <rjw@...ysocki.net>, Viresh Kumar <viresh.kumar@...aro.org>, linux-pm@...r.kernel.org cc: linux-kernel@...r.kernel.org Subject: problem in changing from active to passive mode Hello, I have an Intel 6130 and an Intel 5218. These machines have HWP. They are configured to boot with active mode and performance as the power governor. Since the following commit: commit a365ab6b9dfbaf8fb4fb4cd5d8a4c55dc4fb8b1c (HEAD, refs/bisect/bad) Author: Rafael J. Wysocki <rafael.j.wysocki@...el.com> Date: Mon Dec 14 21:09:26 2020 +0100 cpufreq: intel_pstate: Implement the ->adjust_perf() callback If I change te mode from active to passive, I have the impression that the machine is no longer able to raise the core frequencies above the minimum. Changing the mode back to active has no effect. This persists if I reboot to another kernel. Here are some runs that illustrate the problem. I have tested the benchmark many times, and apart from this issue its performance is stable. Intel 6130: root@...i-2:/tmp# java -jar dacapo-9.12-MR1-bach.jar avrora -n 3 ===== DaCapo 9.12-MR1 avrora starting warmup 1 ===== ===== DaCapo 9.12-MR1 avrora completed warmup 1 in 3420 msec ===== ===== DaCapo 9.12-MR1 avrora starting warmup 2 ===== ===== DaCapo 9.12-MR1 avrora completed warmup 2 in 2536 msec ===== ===== DaCapo 9.12-MR1 avrora starting ===== ===== DaCapo 9.12-MR1 avrora PASSED in 2502 msec ===== root@...i-2:/tmp# echo passive | tee /sys/devices/system/cpu/intel_pstate/status passive root@...i-2:/tmp# root@...i-2:/tmp# echo active | tee /sys/devices/system/cpu/intel_pstate/status active root@...i-2:/tmp# java -jar dacapo-9.12-MR1-bach.jar avrora -n 3 ===== DaCapo 9.12-MR1 avrora starting warmup 1 ===== ===== DaCapo 9.12-MR1 avrora completed warmup 1 in 7561 msec ===== ===== DaCapo 9.12-MR1 avrora starting warmup 2 ===== ===== DaCapo 9.12-MR1 avrora completed warmup 2 in 6528 msec ===== ===== DaCapo 9.12-MR1 avrora starting ===== ===== DaCapo 9.12-MR1 avrora PASSED in 7796 msec ===== ------------------------------------------------------------------------- Intel 5218: root@...ll-2:/tmp# java -jar dacapo-9.12-MR1-bach.jar avrora -n 3 ===== DaCapo 9.12-MR1 avrora starting warmup 1 ===== ===== DaCapo 9.12-MR1 avrora completed warmup 1 in 2265 msec ===== ===== DaCapo 9.12-MR1 avrora starting warmup 2 ===== ===== DaCapo 9.12-MR1 avrora completed warmup 2 in 2033 msec ===== ===== DaCapo 9.12-MR1 avrora starting ===== ===== DaCapo 9.12-MR1 avrora PASSED in 2068 msec ===== root@...ll-2:/tmp# echo passive | tee /sys/devices/system/cpu/intel_pstate/status passive root@...ll-2:/tmp# echo active | tee /sys/devices/system/cpu/intel_pstate/statusactive root@...ll-2:/tmp# java -jar dacapo-9.12-MR1-bach.jar avrora -n 3 ===== DaCapo 9.12-MR1 avrora starting warmup 1 ===== ===== DaCapo 9.12-MR1 avrora completed warmup 1 in 4363 msec ===== ===== DaCapo 9.12-MR1 avrora starting warmup 2 ===== ===== DaCapo 9.12-MR1 avrora completed warmup 2 in 4486 msec ===== ===== DaCapo 9.12-MR1 avrora starting ===== ===== DaCapo 9.12-MR1 avrora PASSED in 3417 msec ===== ------------------------------------------------------------------------- thanks, julia
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