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[66.183.142.209]) by smtp.gmail.com with ESMTPSA id li8-20020a170903294800b001d97fe26d47sm1957350plb.34.2024.02.09.13.38.11 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 09 Feb 2024 13:38:12 -0800 (PST) From: "Doug Smythies" To: "'Vincent Guittot'" , "'Ingo Molnar'" , "'Rafael J. Wysocki'" Cc: , , "Doug Smythies" Subject: sched/cpufreq: Rework schedutil governor performance estimation - Regression bisected Date: Fri, 9 Feb 2024 13:38:14 -0800 Message-ID: <002f01da5ba0$49cbf810$dd63e830$@telus.net> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Outlook 16.0 Content-Language: en-ca Thread-Index: AdpbnQo3jI2AMWzRTQGA64jOQdUYtg== Hi, I noticed a regression in the 6.8rc series kernels. Bisecting the kernel pointed to: # first bad commit: [9c0b4bb7f6303c9c4e2e34984c46f5a86478f84d] sched/cpufreq: Rework schedutil governor performance estimation There was previous bisection and suggestion of reversion, but I guess it wasn't done in the end. [1] The regression: reduced maximum CPU frequency is ignored. Conditions: CPU frequency scaling driver: intel_cpufreq (a.k.a intel_pstate in passive mode) CPU frequency scaling governor: schedutil HWP (HardWare Pstate) control (a.k.a. Intel_speedshift): Enabled Processor: Intel(R) Core(TM) i5-10600K CPU @ 4.10GHz I did not check any other conditions, i.e. HWP disabled or the acpi-cpufreq driver. Example: A 100% load on CPU 5. sudo turbostat --quiet --Summary --show Busy%,Bzy_MHz,IRQ,PkgWatt,PkgTmp,RAMWatt,GFXWatt,CorWatt --interval 15 Busy% Bzy_MHz IRQ PkgTmp PkgWatt CorWatt GFXWatt RAMWatt 8.42 4636 21823 67 28.40 27.56 0.00 2.59 8.40 4577 17724 66 27.57 26.73 0.00 2.59 8.35 4637 19535 66 28.65 27.81 0.00 2.60 8.41 4578 20723 66 27.73 26.89 0.00 2.59 8.40 4558 19156 67 27.39 26.55 0.00 2.58 8.34 4502 18127 67 26.79 25.96 0.00 2.57 grep . /sys/devices/system/cpu/cpu*/cpufreq/scaling_max_freq /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq:2400000 /sys/devices/system/cpu/cpu10/cpufreq/scaling_max_freq:2400000 /sys/devices/system/cpu/cpu11/cpufreq/scaling_max_freq:2400000 /sys/devices/system/cpu/cpu1/cpufreq/scaling_max_freq:2400000 /sys/devices/system/cpu/cpu2/cpufreq/scaling_max_freq:2400000 /sys/devices/system/cpu/cpu3/cpufreq/scaling_max_freq:2400000 /sys/devices/system/cpu/cpu4/cpufreq/scaling_max_freq:2400000 /sys/devices/system/cpu/cpu5/cpufreq/scaling_max_freq:2400000 /sys/devices/system/cpu/cpu6/cpufreq/scaling_max_freq:2400000 /sys/devices/system/cpu/cpu7/cpufreq/scaling_max_freq:2400000 /sys/devices/system/cpu/cpu8/cpufreq/scaling_max_freq:2400000 /sys/devices/system/cpu/cpu9/cpufreq/scaling_max_freq:2400000 grep . /sys/devices/system/cpu/cpu5/cpufreq/* /sys/devices/system/cpu/cpu5/cpufreq/affected_cpus:5 /sys/devices/system/cpu/cpu5/cpufreq/base_frequency:4100000 /sys/devices/system/cpu/cpu5/cpufreq/cpuinfo_max_freq:4800000 /sys/devices/system/cpu/cpu5/cpufreq/cpuinfo_min_freq:800000 /sys/devices/system/cpu/cpu5/cpufreq/cpuinfo_transition_latency:20000 /sys/devices/system/cpu/cpu5/cpufreq/energy_performance_available_preferences:default performance balance_performance balance_power power /sys/devices/system/cpu/cpu5/cpufreq/energy_performance_preference:balance_performance /sys/devices/system/cpu/cpu5/cpufreq/related_cpus:5 /sys/devices/system/cpu/cpu5/cpufreq/scaling_available_governors:conservative ondemand userspace powersave performance schedutil /sys/devices/system/cpu/cpu5/cpufreq/scaling_cur_freq:4799998 /sys/devices/system/cpu/cpu5/cpufreq/scaling_driver:intel_cpufreq /sys/devices/system/cpu/cpu5/cpufreq/scaling_governor:schedutil /sys/devices/system/cpu/cpu5/cpufreq/scaling_max_freq:2400000 /sys/devices/system/cpu/cpu5/cpufreq/scaling_min_freq:800000 /sys/devices/system/cpu/cpu5/cpufreq/scaling_setspeed: [1] https://lore.kernel.org/all/CAKfTPtDCQuJjpi6=zjeWPcLeP+ZY5Dw7XDrZ-LpXqEAAUbXLhA@mail.gmail.com/