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 5E2AA27E7DA for ; Thu, 12 Feb 2026 07:46:40 +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=1770882403; cv=none; b=X6U1KsRepZYb6ok2hHgwr69TTgEqv7u4k5nVyWzk8/Ie+7sabgM3aAIuyFA19pDezpDlVh/ufqEzOtwJC5nnqTVeG/C5l4Jb7O49+ixWaGJlOmb5pNV8JwqpkYSOovORomEX+S+JlrrD4e474nl4Ccin9Hrj/bG35O4mAwMpEvE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770882403; c=relaxed/simple; bh=nhvYnASTGazWUL3pQ6Pui7LSxxqmk0EeJr/9cq84+nQ=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=s9sIcdZj4Jp7UqwTDuqYlMrdu3Afy1XZ7WWMaEExWzXsfwI4/aFP83E/XvuETDmzvkSRSoTP7Uq2C8x9AL41lueRSg7yNGgRagzUbIajxuFCIa4n2dPauA4jno9c25mezlrdiQlcmral1cVLvd2L122QFcC8KNe03QfAtWu4ghk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (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=rugr+/3U; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (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="rugr+/3U" 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=zqmTtJ74rAcZcBSsCkHSne45vI/L4S6WY84yMiEqilY=; b=rugr+/3URs+78tRHGyN9eq7o5+ iN1vCSQE5rWdOFk9cCK6DPNK5rBYjFkHKSz3CFCkD/BdAy5NTfoxOpLFxlFBTkFCOeMKqOGJlPzTT l9BRE14b1wDO4YwqQpbVIqLgsNH2jg8SdU3zZBb9dexp2YFAPWFZ7WbDhYbqcldzTu9A5pTyMuQJu 4pBKQCGHIKnEB1p6Qvbp7i9YjPbRODgJOrBqg1TDJRERomo0uzbIj+4WOLu3bGpsKGECjQgD95YZx dPXQ8orRw261CfXxit0FjvE8tziV4zaoLYCC79JOlc5ESYXL6lj+HkOkYBH8ppwx/cPL9IggsE/AL oFUkODQA==; Received: from 2001-1c00-8d85-5700-266e-96ff-fe07-7dcc.cable.dynamic.v6.ziggo.nl ([2001:1c00:8d85:5700:266e:96ff:fe07:7dcc] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1vqRPB-0000000DrLP-2KYg; Thu, 12 Feb 2026 07:46:29 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 39422300969; Thu, 12 Feb 2026 08:46:28 +0100 (CET) Date: Thu, 12 Feb 2026 08:46:28 +0100 From: Peter Zijlstra To: Vincent Guittot Cc: Doug Smythies , K Prateek Nayak , mingo@kernel.org, juri.lelli@redhat.com, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, linux-kernel@vger.kernel.org, wangtao554@huawei.com, quzicheng@huawei.com, wuyun.abel@bytedance.com Subject: Re: [PATCH 0/4] sched: Various reweight_entity() fixes Message-ID: <20260212074628.GK1395416@noisy.programming.kicks-ass.net> References: <20260203111134.GL1282955@noisy.programming.kicks-ass.net> <38ef3462-4c4e-4f40-8d63-84dd71cbd043@amd.com> <20260209154718.GW1282955@noisy.programming.kicks-ass.net> <002501dc9b16$442a7050$cc7f50f0$@telus.net> <20260211090144.GY1282955@noisy.programming.kicks-ass.net> <20260211104833.GH1395416@noisy.programming.kicks-ass.net> <20260211162149.GJ1395416@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: <20260211162149.GJ1395416@noisy.programming.kicks-ass.net> On Wed, Feb 11, 2026 at 05:21:49PM +0100, Peter Zijlstra wrote: > On Wed, Feb 11, 2026 at 11:48:33AM +0100, Peter Zijlstra wrote: > > > Now let me go check on that latency thing from Doug (although hopefully > > that was the same boo-boo). > > Only ~3 hours so far, I'll let it run overnight. > > So on my ADL with P-cores only (unplug the E things): > > $ NR=`grep -c processor /proc/cpuinfo`; for ((i=0; i<$NR; i++)) do yes > /dev/null & done > $ turbostat --quiet --Summary --show Busy%,Bzy_MHz,IRQ,PkgWatt,PkgTmp,TSC_MHz,Time_Of_Day_Seconds,usec --interval 1 --out /dev/shm/turbo.log > > $ gawk '/^usec/ {next} { if (T) { d=$2-T; bucket[int(d*1000)]++; } T=$2 } END { for (i in bucket) { printf "%0.3f: %d\n", i/1000, bucket[i] }}' < /dev/shm/turbo.log > 1.000: 4943 > 1.001: 5000 > 1.002: 21 > 1.003: 10 > 1.004: 1 > 1.005: 1 > At 18+ hours: 1.000: 32458 1.001: 32973 1.002: 121 1.003: 63 1.004: 6 1.005: 2 I think we can consider this good :-) *phew*