From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 C4D7D20299B for ; Wed, 11 Feb 2026 16:22:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770826934; cv=none; b=RufLEmYxl45SuqMgXHiqwHDwlwoW+RSc9wshP7Ez3xhnntbaISx8+r83/9oudzFKHFqyP4TsjtrP+eRxpIfgaJQhHk6tBg93+3pZDsMJBYjo5fZIlTKVZ3z9rm8dtOr/c7qdhtK6lDIMdJHfjf+VjTkxRLmCy/ARf66QwI/h6II= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770826934; c=relaxed/simple; bh=qtd/eCrgHWseBHCCch9/dfdHejuCSNflPO3cBqjyzWo=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=EP0CBXhcprl/7an7CPIaB5sSHLbcanB9ot/4+uGvEEn+Gzf896XW7oIy1xcNoOjI3hSIt7B0tTfm63aBxKas87MmeKyj2wd8fTANogvq5TC+fUY7khbc5aX3v1ZMLPZWFraqnAPDwqSW+qZFNXWD+zwhHEAlcgmf/5b7sjwqVZg= 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=di2Lej39; arc=none smtp.client-ip=90.155.92.199 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="di2Lej39" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; 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=qtd/eCrgHWseBHCCch9/dfdHejuCSNflPO3cBqjyzWo=; b=di2Lej39Af2QQ9c9oN5NzoTI3n LGBixMTKENE2Wukjf4sbBQNuu6B9XAvXWIuYra4q+zGWW8C4zi/zNED/RRDdl9ptcaW2eMK/sKfMo 2VFn4EEx4umaUprT9wMnluPWUwpwpmt1DXzREpB9o1LMAOXFQrheA++IWgbDv1kTCZByCufviyTp9 4FEARUI09ExR4TpnTToScKxT8VIY3UB0Nwu1ir4zpmIMQVSvdJwL13VnszeH+RK7DOCry9nnzmlG2 brCBk7OY5vvxruB/Tuo7B6dSN8TKVVX78rj6lzlbcdC3kYBnUoacoVOCQkm7mgmZOfCUYkIgnocig Uh/n5mXQ==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1vqCyT-00000009xnz-0B1x; Wed, 11 Feb 2026 16:21:59 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id F0157300BD2; Wed, 11 Feb 2026 17:21:49 +0100 (CET) Date: Wed, 11 Feb 2026 17:21:49 +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: <20260211162149.GJ1395416@noisy.programming.kicks-ass.net> References: <4c48fe59-8ff3-41fb-83cb-869409f6fbc6@amd.com> <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> 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: <20260211104833.GH1395416@noisy.programming.kicks-ass.net> 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 Which seems to suggest things are looking better again.