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 E032BCA64 for ; Mon, 6 Jan 2025 17:04:58 +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=1736183100; cv=none; b=qQJXXOlKoX6eYerB/tIDLb33ynS+4lt1CDgsApugpZvEyyb3gS6M5YEJKOlKhCvEuYUkGADtAObR3rqzyFjYi7F8s5nT5I6hgixI4/SbwoasUBqWMARE3e13xaO4kmegnf8ldL/5OXcM2bwD4A7+t6xReP91QWcR/xrkB8AeQbY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736183100; c=relaxed/simple; bh=G1NADPhDsBnD2peR6it5CPw5ftIEkxw1N5it/tFjDRg=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=RcINKPZTWjZdCVFHx+MXTJEAF1sStGQMqkq+an9bIYJCvQeJxjBubr9azwjst2rXV6Kzi62CQ/9pHCIP1DvGsvXYcCjdKfu7REK/bWr74ynVuCwTi97Mbmxk2+UgXX8z52IJmpKcan9bhlgeuKT0l5Sh1ePXP51TlwTmj732dVg= 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=Un03IqsF; 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="Un03IqsF" 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=sxUt1GxL1qjdiqvxnkxIIth9FtcSEYhwTUWW43C1J3c=; b=Un03IqsFNWrsUlUiJFQFeAjeXP jTA9c23kGD+g7PJOTI28mVjDtSle6wMh66A93r+bNZE+YYT+gCRr2CeGdQQDl6M8j9ARbdxsmK9R+ dkGqVka7YvYgQ37N+lcgw0vTPMrXlhWtrU6jraIvo1pZGtl/ttFuofuGa9HiS6CfhotdcdQH3fLpK Sc2x1CojZyKecapb/N9PgPzucDNoE6/k92pkBOqWUoXd/CN+0qIk4vOpgeoj3Y5neAPAiQP98l6GE VVLkpj2HcG2yV29lBH5PggYQaws/7TczOstknVgZHODHtDb42JnagS85XBy1FyIB6MtbZdAWMhToG JEJAyxxw==; 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 1tUqXA-0000000Gi6T-0S96; Mon, 06 Jan 2025 17:04:56 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id E18D63005D6; Mon, 6 Jan 2025 18:04:55 +0100 (CET) Date: Mon, 6 Jan 2025 18:04:55 +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: <20250106170455.GB22191@noisy.programming.kicks-ass.net> References: <005f01db5a44$3bb698e0$b323caa0$@telus.net> <20250106115732.GE20870@noisy.programming.kicks-ass.net> <000801db604b$e0f6b580$a2e42080$@telus.net> <20250106165932.GG20870@noisy.programming.kicks-ass.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: <20250106165932.GG20870@noisy.programming.kicks-ass.net> On Mon, Jan 06, 2025 at 05:59:32PM +0100, Peter Zijlstra wrote: > 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. > And just as I send this, I see these happen: 100.00 3100 2793 40302 71 195.22 100.00 3100 2618 40459 72 183.58 100.00 3100 2993 46215 71 209.21 100.00 3100 2789 40467 71 195.19 99.92 3100 2798 40589 71 195.76 100.00 3100 2793 40397 72 195.46 ... 100.00 3100 2844 41906 71 199.43 100.00 3100 2779 40468 71 194.51 99.96 3100 2320 40933 71 163.23 100.00 3100 3529 61823 72 245.70 100.00 3100 2793 40493 72 195.45 100.00 3100 2793 40462 72 195.56 They look like funny little blips. Nowhere near as bad as you had though.