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 4114629ACD1; Tue, 10 Mar 2026 18:50:10 +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=1773168617; cv=none; b=uU2Bp17e9J6BXk6nvfNul8q89MAJZa5io2SygrXR+yJav9KYz7VS33nhCeLGFtIJPgRuCIq+r3+dCWL3OUlFVRfmeSgbE/TQfQSGRHwqfeaj3o+S/a66lDnzk8AvfixZ2B2/eUfDiQn0AzQjjVd02nBPADkDV4aMv+t/0b89UrQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773168617; c=relaxed/simple; bh=wqjChQ1zE1ByHwbFYw/OrwIOvpLIcL8cn0L9GZnTATc=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=BBFxaS94LYceA4TJkVgZrwb4uw9HxJVpCd1OqHfgKmRMzGcZdlOBnHXHS2DrK2Ft6wYr/zhshdyPm16T7REQ4EBbdJ3b3cXlnPG44e0FmfBLyagx9oQRj9e1qTjret7WYlle46iJqMNfIftFcoizOsZQuAHDQmI/wlj0nVJJiOs= 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=qGE0lnjr; 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="qGE0lnjr" 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=n1PyZU3SS2GBIxf+msnEkrQCWoeNRpmUUwExG511ZlY=; b=qGE0lnjrfr/c2Ofp3icoRQuRtB oq2G1lUsn3cz20aLmgP+VLGS4zQOvPPeud3AaovV0eHFwSmVbHNoZg/vuZp6hYEdtWtogjmfJ+Bpe 7GkCKgvP8XnhxtLtee+ZLJEH5JesYHzHn5Bz5KTnwqlubAYguA2NzZcfLrY4PaxmdDdR/OS18m5Ji J6R7/m2YaCqUF4XNkWC+Jlufh+hVUDlbN+jdFBGbU3hhzDPLJ68IRxxfcwZmraI4bpptQFtU2QeJi 8MyVcgyUyy60+81Cyzl7tcHXOne9+5HA0jL1tOOGuYDCWsmlPpyMVS6j95ZFDyEjkwS+hWC/x/VnW Y9Kygc/g==; 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 desiato.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1w029f-0000000FMgt-2qD9; Tue, 10 Mar 2026 18:50:07 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 64181300462; Tue, 10 Mar 2026 19:50:06 +0100 (CET) Date: Tue, 10 Mar 2026 19:50:06 +0100 From: Peter Zijlstra To: Joe Talbott Cc: kernel test robot , oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, x86@kernel.org, Thomas Gleixner Subject: Re: [tip:sched/hrtick] [hrtimer] 2889243848: stress-ng.timermix.ops_per_sec 30.1% regression Message-ID: <20260310185006.GD652779@noisy.programming.kicks-ass.net> References: <202603102229.74b9dee4-lkp@intel.com> <20260310152350.GF606826@noisy.programming.kicks-ass.net> <20260310181651.GH606826@noisy.programming.kicks-ass.net> Precedence: bulk X-Mailing-List: oe-lkp@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260310181651.GH606826@noisy.programming.kicks-ass.net> On Tue, Mar 10, 2026 at 07:16:51PM +0100, Peter Zijlstra wrote: > On Tue, Mar 10, 2026 at 01:11:09PM -0400, Joe Talbott wrote: > > > It looks like it can be found here: > > https://download.01.org/0day-ci/archive/20260310/202603102229.74b9dee4-lkp@intel.com/repro-script > > > > stress-ng --timeout 60 --times --verify --metrics --no-rand-seed --timermix 64 > > Thanks, that does indeed work and show the regression. > > Lets see if I can spot the fail... It looks like that benchmark manages to trip significant nr_hangs, and yes, I made those more expensive because those were not expected to actually happen at any sane rate. Lets see if we can cure that without making a giant mess of things.