From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ed1-f52.google.com (mail-ed1-f52.google.com [209.85.208.52]) (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 E8A744F61B for ; Wed, 10 Jan 2024 22:57:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linuxfoundation.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="OAHDw2r3" Received: by mail-ed1-f52.google.com with SMTP id 4fb4d7f45d1cf-55790581457so4958452a12.3 for ; Wed, 10 Jan 2024 14:57:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=google; t=1704927453; x=1705532253; darn=vger.kernel.org; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=2MyVBNX2RTaW1r7FyIy8YJ/4uKyEfeD9kNrWweEsw00=; b=OAHDw2r35G0N6T1rBJtJQgAk5oOGA9bJvtMgGdnDAUze/9tN7gEuYvbg0rCumkDwYN tM1AeCwI1L9FSogYcZYieHfEaj+vdFxaxZRPPKDVI92Wzv0kYR75x6itp4KQZF3zzyXf oVmHWmuhIcO5ImT74YjKbWHbh025vF4DrB6rg= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1704927453; x=1705532253; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=2MyVBNX2RTaW1r7FyIy8YJ/4uKyEfeD9kNrWweEsw00=; b=B0fdircHPig+DBos6LI1aaCYBNSeCLSHzUw6566Vr+SPFKFgweAPsDY8dqrpFpecHy JPhHlW0GhxPf3RRSx6/LEKVV1obZXlKXdbw2LwuFnM5TQfT0AAOkh1o/3CodeM52Xje6 lQkrnTgFwYtBXAA1fC+wDwdJr5u7YF/n6iVbF+14gK+3DGZOPp6HiF1AyAY7LqvXNwWs tkG9jqgOhuOZwGyMH82DXCC8+VLV3ynGnuV68UB96Ii9uwzTJx+DwqUyGMFkKa0Og74r 5w49/gESN2s7YN4NFn9jmwSttDHl3YnG2Dn7Fo+p9auT4A+3EpxNxqWrPAneilXhPKIW z3qg== X-Gm-Message-State: AOJu0YwNaHkho14bVplFlx9lsttZmRnDGJJ2Iw7lwmqypz3CnV2o3VSy rgNdH7uoW+0I1Q9RFj5plM+qTFllhgVbbxLh7M+uemOLwRzQPNyv X-Google-Smtp-Source: AGHT+IHxUHrQmP+AOWk/p4RV9xJCHZuHXa9fpbTgLe0Z6/P7ziQN9feM0kpXfvN7bArfeN+f872wRA== X-Received: by 2002:a17:906:371a:b0:a2c:199d:557f with SMTP id d26-20020a170906371a00b00a2c199d557fmr98000ejc.51.1704927453027; Wed, 10 Jan 2024 14:57:33 -0800 (PST) Received: from mail-ed1-f48.google.com (mail-ed1-f48.google.com. [209.85.208.48]) by smtp.gmail.com with ESMTPSA id n11-20020a170906688b00b00a28e533acabsm2499343ejr.190.2024.01.10.14.57.31 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 10 Jan 2024 14:57:31 -0800 (PST) Received: by mail-ed1-f48.google.com with SMTP id 4fb4d7f45d1cf-55790581457so4958424a12.3 for ; Wed, 10 Jan 2024 14:57:31 -0800 (PST) X-Received: by 2002:a17:906:c1c3:b0:a29:905d:447b with SMTP id bw3-20020a170906c1c300b00a29905d447bmr95424ejb.96.1704927450968; Wed, 10 Jan 2024 14:57:30 -0800 (PST) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: In-Reply-To: From: Linus Torvalds Date: Wed, 10 Jan 2024 14:57:14 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [GIT PULL] Scheduler changes for v6.8 To: Ingo Molnar , Vincent Guittot Cc: linux-kernel@vger.kernel.org, Peter Zijlstra , Thomas Gleixner , Juri Lelli , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Valentin Schneider Content-Type: text/plain; charset="UTF-8" On Wed, 10 Jan 2024 at 14:41, Linus Torvalds wrote: > > It's one of these two: > > f12560779f9d sched/cpufreq: Rework iowait boost > 9c0b4bb7f630 sched/cpufreq: Rework schedutil governor performance estimation > > one more boot to go, then I'll try to revert whichever causes my > machine to perform horribly much worse. I guess it should come as no surprise that the result is 9c0b4bb7f6303c9c4e2e34984c46f5a86478f84d is the first bad commit but to revert cleanly I will have to revert all of b3edde44e5d4 ("cpufreq/schedutil: Use a fixed reference frequency") f12560779f9d ("sched/cpufreq: Rework iowait boost") 9c0b4bb7f630 ("sched/cpufreq: Rework schedutil governor performance estimation") This is on a 32-core (64-thread) AMD Ryzen Threadripper 3970X, fwiw. I'll keep that revert in my private test-tree for now (so that I have a working machine again), but I'll move it to my main branch soon unless somebody has a quick fix for this problem. Linus