From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f176.google.com (mail-pl1-f176.google.com [209.85.214.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3DC9B21345 for ; Fri, 9 Feb 2024 21:38:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.176 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707514695; cv=none; b=eE04Kofpxih0H8lM4qAGn7SG+sHtbtxOPwQ6OGYtt7OUH7gh+WJ9vf7iMiOb52UaTpIVXFq5NlI7JlB2laCusb0gm+h0vrTz5rO8wJRbadRPiHt8udS3hCZv8YYrR2qlkRDJKoW6lDe0r8YXVK0vs0ifeGfXhLdPXU5Uf25uAG4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707514695; c=relaxed/simple; bh=VMCz8O3uEXO4bC54yXRW/u3Prkn+dR8NrfSUwRHRXNY=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=bqnANAB2AqT8cypHF3GtzGGugY/16JG68eEWR+1EmFQTffkktaHRS34DnEK+KAI/ldjDd8sB34kERgoQRMUyVYU+dMcZDrmrsR7sdrUtFWP7eX5RXQZPc4yqXSTagyiln4MjIl+Woaq7pkeG+7KzLlPvFBq+f3zXJ4Rj/ui8ofE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=telus.net; spf=pass smtp.mailfrom=telus.net; dkim=pass (2048-bit key) header.d=telus.net header.i=@telus.net header.b=YjGlBYXr; arc=none smtp.client-ip=209.85.214.176 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=telus.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=telus.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=telus.net header.i=@telus.net header.b="YjGlBYXr" Received: by mail-pl1-f176.google.com with SMTP id d9443c01a7336-1d7393de183so11581975ad.3 for ; Fri, 09 Feb 2024 13:38:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=telus.net; s=google; t=1707514692; x=1708119492; darn=vger.kernel.org; h=thread-index:content-language:content-transfer-encoding :mime-version:message-id:date:subject:cc:to:from:from:to:cc:subject :date:message-id:reply-to; bh=3Gn35MQPFitK/RkErnBz6AmQLFmvJyKpC3m6ymwsMYo=; b=YjGlBYXrw38QRhYirbjYreZryqciu81AWOluL3b0F7lxAvTNyN65/W2ZqCcHrci2Hu tKPXCTMUbUQHE4EeJtcuwT8bPPGhXmsZBtrgm3Xb/P5UskGiUe1z0oySr2U6ulaG7AwP rhxTzQI052A39fIzVk1TFiLZNLKDvV2vRYzQjcoszkdv1But0PlJE3PHrhEfipE2kTVQ edS08g1RG+YK0V6kBnqWxz9ARvj5MZaTJsXLwuM+SKobDrtnXEcHN2t90Ttu4w035qr8 g7+USz2OPUpC5ZcwHkSPL06UAev/XtVFYdCikuv/1/1gZtW7xd1HZtyCjaU3YMQOmjQe DFOA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1707514692; x=1708119492; h=thread-index:content-language:content-transfer-encoding :mime-version:message-id:date:subject:cc:to:from:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=3Gn35MQPFitK/RkErnBz6AmQLFmvJyKpC3m6ymwsMYo=; b=cJahfBivtIg8P53zZfP43rZG6A6FVHNCaMO7b2CKjy9Jv5YVG1xzck+9olmDB5Wjmd DFDVH30vER0slWxBXKqrKdawcXBn4XfiEme6Pk1xshJ2flhKkimDOSMAp20rIwTH7Gew G/D5EgbKbdhU0dpZLMx98PSZzdIERRhg7wXcLkJ5O//5Wxgqnb45A+hW5DdjOMZ3xBxT s6BEeMzvl4zbjlcWdp7ARVTPNWOphIQtghnjvXgfE05akrSnugowfoLwDiv/b+dOpF3U qJH1oE1Anq6ok5Nm/VlmDnk/JImjnBpexNGHsQVpTIhvq6CT10U8KhbrUlRVaKidAGBW Vi1Q== X-Gm-Message-State: AOJu0Yz/CKP7klH/Ae+GW0AU1uPGGhISVynsQIxXSRqo9m6v5oU3UnKl r+gXcEO8c3kwQUY3Blrz8hbKo7gfQNu8OcEc2sFO8bUpJanT+a6rsgEn2yGPq0M= X-Google-Smtp-Source: AGHT+IHZiIoJhTIlf6Z/TAkUtq1febjHN+ZiTHR+u2eS/63Mz8GtyS137SCPx2c37UyumtTZ3OJ5Vg== X-Received: by 2002:a17:903:2448:b0:1d9:1cb5:558b with SMTP id l8-20020a170903244800b001d91cb5558bmr452175pls.15.1707514692488; Fri, 09 Feb 2024 13:38:12 -0800 (PST) X-Forwarded-Encrypted: i=1; AJvYcCUmTkwkSKpr7cQ3KShselWIGQkGdjDq3IJX6BbybkJjbr7m+EIiurn11xe+lWgtCdOXt1d5/NR48XyVCKo8iEbLbdyRMlGI/QXX9QAUEPKtyvUwsHrqy5NTOVYQ4PreNU0tLh+ZCxaPGwXC5jCVbO9OjV6AYRuklahVqfhB3LmsGdi6ZiDC9g== Received: from DougS18 (s66-183-142-209.bc.hsia.telus.net. [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-kernel@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/