From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.1 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 41CD6C43461 for ; Fri, 4 Sep 2020 15:57:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 197032074D for ; Fri, 4 Sep 2020 15:57:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=mailbox.org header.i=@mailbox.org header.b="JvHApvPT"; dkim=pass (2048-bit key) header.d=mailbox.org header.i=@mailbox.org header.b="bmt+oMpu" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726654AbgIDP5a (ORCPT ); Fri, 4 Sep 2020 11:57:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45682 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726063AbgIDP52 (ORCPT ); Fri, 4 Sep 2020 11:57:28 -0400 Received: from mout-p-101.mailbox.org (mout-p-101.mailbox.org [IPv6:2001:67c:2050::465:101]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E4828C061244; Fri, 4 Sep 2020 08:57:27 -0700 (PDT) Received: from smtp2.mailbox.org (smtp2.mailbox.org [80.241.60.241]) (using TLSv1.2 with cipher ECDHE-RSA-CHACHA20-POLY1305 (256/256 bits)) (No client certificate requested) by mout-p-101.mailbox.org (Postfix) with ESMTPS id 4Bjj4202B3zKmgZ; Fri, 4 Sep 2020 17:57:22 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mailbox.org; h= content-language:content-transfer-encoding:content-type :content-type:in-reply-to:mime-version:date:date:message-id:from :from:references:subject:subject:received; s=mail20150812; t= 1599235038; bh=IfbqbAynnmqph8MOdKpdNnD6H2jlmEmAh/USR0WprNQ=; b=J vHApvPT+4EMxw6SriHQ/P9Fnd6/XIqD37ZcMH/Nih4tMYqBx2x+IamTY3uEDYAt8 skSRkKnHAmL2MeJVSDBmJUejgcMDHI9vVLAFhhynMEnayFfDOYwS7yA21kRq29CM R5ALAaAkgAB/LYZ3EEjNZdx+7F3y3p6/vR8ib2jnvWUX4o632hP/VPpcjjvloHdd h3xRBcqjZWb8W5hSvkJkwgTTgmZRGEnJv8QXyanhkC8wFfHyHUJQA0eT7NjcbafR fAJN5YU+kJDN+XiWdG6iPTsSR9RzKyeht0sPA1f6e8KQ3s84wQxOxIgiCcnCLEXl VeAHykOg9Fap3RPft3i5w== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mailbox.org; s=mail20150812; t=1599235040; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=zpbGrYXWP/yGCKsnNdD8K9eAP1BmEsLdGpvnWaHq9rI=; b=bmt+oMpuCBXaASht7+BBjNGx6BVxlcZiBEQl7R2mdwqFSIXGO//tJep7BNls1dtL3qtsxF yAcAvUJlJAMauTOWJtg0wj3JRD26nMY/2sSPa/1oPjaY5NTxDFFhFe5L2E5pcWICVKyUBH fxJj2hUngCu1DVJAHW40aiaEYLGjoN8lBpP+yk5M210jadeoY75prly0CkO4FXHwyag0B7 8iFpNwbic26uhHY5WhNcg1vgM9C10VTmf7mLjgXt3cK/yNRfP9Y+Gvlthe6TZ/r/glulMq 1rd8jDDsprHJj6LRpk0FZYvrrN7VU7IDuG+I3691jev+3AZxkU5G+kLPQ8AQ0g== X-Virus-Scanned: amavisd-new at heinlein-support.de Received: from smtp2.mailbox.org ([80.241.60.241]) by spamfilter05.heinlein-hosting.de (spamfilter05.heinlein-hosting.de [80.241.56.123]) (amavisd-new, port 10030) with ESMTP id F7yNVVoBbHKf; Fri, 4 Sep 2020 17:57:18 +0200 (CEST) Subject: Re: kworker/0:3+pm hogging CPU To: Michal Hocko , Mathias Nyman , Alan Stern , Salvatore Bonaccorso Cc: LKML , Greg KH , linux-usb@vger.kernel.org, "Rafael J. Wysocki" References: <20200720173807.GJ1228057@rowland.harvard.edu> <20200720174530.GB4061@dhcp22.suse.cz> <20200720174812.GK1228057@rowland.harvard.edu> <20200720181605.GC4061@dhcp22.suse.cz> <20200720200243.GA1244989@rowland.harvard.edu> <20200721055917.GD4061@dhcp22.suse.cz> <20200721143325.GB1272082@rowland.harvard.edu> <20200829095003.GA2446485@eldamar.local> <20200829155949.GA499295@rowland.harvard.edu> <38dfdef4-f9ab-1755-8418-2285d843af86@linux.intel.com> <20200901152728.GI16650@dhcp22.suse.cz> From: Dirk Kostrewa Message-ID: Date: Fri, 4 Sep 2020 17:57:16 +0200 MIME-Version: 1.0 In-Reply-To: <20200901152728.GI16650@dhcp22.suse.cz> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-MBO-SPAM-Probability: X-Rspamd-Score: -2.84 / 15.00 / 15.00 X-Rspamd-Queue-Id: A6E0A179E X-Rspamd-UID: 7fae64 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, meanwhile, I convinced Dell that I have a hardware issue (and not a Linux issue), and Dell has replaced the mainboard of my laptop. After that, both the USB over-current kernel messages and the kworker processes with permanent high CPU load are gone. So, this was indeed a hardware issue! Many thanks for your feedback and help! Best regards, Dirk. Am 01.09.20 um 17:27 schrieb Michal Hocko: > On Mon 31-08-20 14:37:10, Mathias Nyman wrote: > [...] >> I can't come up with any good solution to this right now. >> Only bad ideas such as >> a. Add a sleep to the over-current case, >> doesn't solve anything else than the ~100% cpu hogging part of the problem > This sounds like a better thing from the user space point of view. I do > not have any insight on what kind of other side effects this might have > so I didn't dare to try that on my piece of (broken) HW. I do not see > the problem all the time and I plan to replace it soon anyway. > > Considering that tweaking the power management helps maybe that could be > done automagically after many consecutive failures. > > Just my 2c