From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753269AbcANJd1 (ORCPT ); Thu, 14 Jan 2016 04:33:27 -0500 Received: from mail-wm0-f43.google.com ([74.125.82.43]:33057 "EHLO mail-wm0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752096AbcANJdV (ORCPT ); Thu, 14 Jan 2016 04:33:21 -0500 Message-ID: <1452763998.3460.83.camel@gmail.com> Subject: Re: [ANNOUNCE] 4.4-rc6-rt1 From: Mike Galbraith To: Sebastian Andrzej Siewior Cc: Clark Williams , Thomas Gleixner , LKML , linux-rt-users , Steven Rostedt Date: Thu, 14 Jan 2016 10:33:18 +0100 In-Reply-To: <20160113175845.GK29964@linutronix.de> References: <20151223225755.GA21121@linutronix.de> <20151231102441.581ce1e1@sluggy.hsv.redhat.com> <1451632781.9800.22.camel@gmail.com> <20160113175845.GK29964@linutronix.de> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.16.5 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2016-01-13 at 18:58 +0100, Sebastian Andrzej Siewior wrote: > * Mike Galbraith | 2016-01-01 08:19:41 [+0100]: > > > > PID USER PR NI VIRT RES SHR S %CPU %MEM > > > TIME+ COMMAND > > > 3 root -2 0 0 0 0 S 37.3 0.0 > > > 307:52.44 ksoftirqd/0 > > > 32 root -2 0 0 0 0 S 37.3 0.0 > > > 308:08.72 ksoftirqd/2 > > > 42 root -2 0 0 0 0 R 37.3 0.0 > > > 308:32.84 ksoftirqd/3 > > > 22 root -2 0 0 0 0 S 26.9 0.0 > > > 222:29.82 ksoftirqd/1 > > > 1 root 20 0 46628 6980 4976 S 1.3 0.2 > > > 0:13.98 systemd > > > 22358 williams 20 0 159980 4552 3780 R 1.0 0.1 > > > 0:00.39 top > > > > Heh, I didn't notice immediately because I throttle nohz, am seeing > > only tiny utilization (but nohz idle isn't working). With throttle > > patch removed, box is screaming, expires=4294990471 pokes eyeball. > > This is due to NO_HZ as far as I can tell. My AMD A10 in idle mode > has > 0.7% utilisation of ksoftirqd/ with CONFIG_HZ_PERIODIC and with > CONFIG_NO_HZ_FULL it shows about 25% on all CPU threads. Thomas said the hrtimer adjustments went a little out of round. I started rummaging, but then the world woke up from the holidays, so I didn't get _to_ square one, much lest past it. Hohum. -Mike