From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CB90F13698E for ; Mon, 6 Jan 2025 16:59:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736182778; cv=none; b=ndk0/uUO+IJmVs8lw4p6ZYi3m1OyrfmUwpueTzNNg7jvQPgMY0Ve6OZt+syzGP6lenPi8FDVk1Jlh2REm1EkeEksbqA0ZG/E+32YSOJ98mMJG1jjtgTqyFDKTzoe/b8jfYutl6ynWmG5pw47l/E0qWzvt9RT4AYVSrddaLyeaQk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736182778; c=relaxed/simple; bh=FVQtGkFU1yNncFso3ZpdsMmFRPtmRrmEnA57OOA08p4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=YECkBa6s+KIRWBwofi4tXwnU5p4j4rASUVn2Cx3WeOas9F0j1vNI1Jr7XmF3iuyj+962x92Vc62Khmo7y1dSJLlgultFgj/ep1JAJCrR4kOJ5TvVVzx2291GHl9zxJc7WJhTNDVS+/7aH6JoUEZ6xI5ISc8vQxKZ+jf5qfmrwkU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=uALZQ4cJ; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="uALZQ4cJ" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=bn/COM+YK50xx6KyPiqaZEsk35rNMeyJAgIIjNioJaE=; b=uALZQ4cJw7IyfYf1UXFusFQ1KG c7oMveIZ85X0rBXQOLgsUgmPYeym1Nck3QtSbvY8kCFJqdWDbbauuqcqrKwMUG2n+vNtN1cVqum8A iji0VP9hHdvEhxYvlZReHRXCUQ56zUZCQv1HdqcjXcSPEF0AOYDIdY3nPH/lksOYV5TNAGGgsXNuc 6Ngisa0z4YsPvfkFcJwHT/UmYctvbhq4tpRw/C52G82Z3aXqBSKCvtJkgqA1TKDZ4E6GoV9BzAop6 wZA6GOWv1WqxQMgdSaTiIPWHZYu8z0J41SR1FXZQoBL9JF3YPjJimyCl2gQL7T0L6BOWq+91ze4rI ViyPBVZg==; Received: from 77-249-17-89.cable.dynamic.v4.ziggo.nl ([77.249.17.89] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tUqRy-0000000Gfjq-0IUM; Mon, 06 Jan 2025 16:59:34 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 981713005D6; Mon, 6 Jan 2025 17:59:32 +0100 (CET) Date: Mon, 6 Jan 2025 17:59:32 +0100 From: Peter Zijlstra To: Doug Smythies Cc: linux-kernel@vger.kernel.org, vincent.guittot@linaro.org Subject: Re: [REGRESSION] Re: [PATCH 00/24] Complete EEVDF Message-ID: <20250106165932.GG20870@noisy.programming.kicks-ass.net> References: <005f01db5a44$3bb698e0$b323caa0$@telus.net> <20250106115732.GE20870@noisy.programming.kicks-ass.net> <000801db604b$e0f6b580$a2e42080$@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-Disposition: inline In-Reply-To: <000801db604b$e0f6b580$a2e42080$@telus.net> On Mon, Jan 06, 2025 at 07:01:34AM -0800, Doug Smythies wrote: > > What is the easiest 100% load you're seeing this with? > > Lately, and specifically to be able to tell others, I have been using: > > yes > /dev/null & > > On my Intel i5-10600K, with 6 cores and 2 threads per core, 12 CPUs, > I run 12 of those work loads. On my headless ivb-ep 2 sockets, 10 cores each and 2 threads per core, I do: for ((i=0; i<40; i++)) ; do yes > /dev/null & done tools/power/x86/turbostat/turbostat --quiet --Summary --show Busy%,Bzy_MHz,IRQ,PkgWatt,PkgTmp,TSC_MHz --interval 1 But no so far, nada :-( I've tried with full preemption and voluntary, HZ=1000.