Received: by 2002:a05:6a10:9e8c:0:0:0:0 with SMTP id y12csp128005pxx; Tue, 27 Oct 2020 23:55:23 -0700 (PDT) X-Google-Smtp-Source: ABdhPJze3ui6tH6s8CH468qkMi5/dsm+w3bmo1kbHVg8V6TRZCxyzYHBCZD/Zz+ZHG5p68lJQVEn X-Received: by 2002:a17:906:b0d6:: with SMTP id bk22mr6010914ejb.153.1603868123543; Tue, 27 Oct 2020 23:55:23 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1603868123; cv=none; d=google.com; s=arc-20160816; b=DHCLsi+dfYoZUgzeMAL3sOrGwHSKCYNExEg+lqqHYBSKt+5aXtlu6nYDoGE7BV3EP+ w9S1VRUKz2+Bn1HvL8f0o3aE6ZRUHRSp/Dhku47JztLLWhcOJuFjfHfkNwyZZM+X+jMM YUgpyHE6DQmzpa3lo7+QLat0XiJHjehb4TIETd8vu847U0NE50zN6WgQPXlsFe41bjUw nb3QsW1Uvm5Ms21aZCGENJyw0bWLPevXipZQYp/KXB7NzkUxeEZJPvysZxsYDK5TH2SD uFYDwkh8IA7uZpiuRPP0vbDRoQRh3YQwIp3P7DQDePfnKiMe03vqodzgy/4YrSpPv5D7 /iGQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:in-reply-to:content-disposition:mime-version :references:message-id:subject:cc:to:from:date; bh=zoGGsfPQ5WBsZubndXffV0euN1wwoM6+TWU2hdmk0SA=; b=WNFAfSyIVQ4YwpXkNKRQ+stBRRy6wcqaCCaNYHO0lNwFa9E1w57L29a8fp1Xu/QIqk nXpW5uGERS1cCDMB2xQ0k/GqPYWU7FEF2FFMDu2MDOpauHaPW647rslXsIBEE4/9/pg7 jA9saNnzW3pYOoHh4qUZKBSafQ4TDpfrQYKBPUBYIXWUltSRMfu1oUfStEd3SHehrTxu s/1GK3Hf0bqQKx6steMzMXP8ekn/e33p17Ub0MSxiekfTenUmy9uljxENrO9BUIF3Ul7 4DoEf2HQIGMfsdrDFmwl+eKxuYdYU6uZtBkLZaRcV1gS4wkneCkPn992CCcBYZHlg1fb IAug== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=monom.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id d14si2732415edu.275.2020.10.27.23.55.01; Tue, 27 Oct 2020 23:55:23 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=monom.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2898472AbgJ0KgE (ORCPT + 99 others); Tue, 27 Oct 2020 06:36:04 -0400 Received: from mail.monom.org ([188.138.9.77]:54478 "EHLO mail.monom.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2898415AbgJ0KeO (ORCPT ); Tue, 27 Oct 2020 06:34:14 -0400 Received: from mail.monom.org (localhost [127.0.0.1]) by filter.mynetwork.local (Postfix) with ESMTP id C727C50046C; Tue, 27 Oct 2020 11:34:11 +0100 (CET) X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on mail.monom.org X-Spam-Level: X-Spam-Status: No, score=-2.5 required=5.0 tests=ALL_TRUSTED,BAYES_00 autolearn=ham autolearn_force=no version=3.4.2 Received: from localhost (unknown [94.31.100.251]) by mail.monom.org (Postfix) with ESMTPSA id 65E70500299; Tue, 27 Oct 2020 11:34:11 +0100 (CET) Date: Tue, 27 Oct 2020 11:34:11 +0100 From: Daniel Wagner To: Sebastian Andrzej Siewior Cc: Thomas Gleixner , LKML , linux-rt-users , Steven Rostedt , Clark Williams Subject: Re: [ANNOUNCE] v5.9.1-rt19 Message-ID: <20201027103411.h5ushvwsrovxls5u@beryllium.lan> References: <20201024091838.gzhn2dlx2j7xnixg@linutronix.de> <20201027093616.5vn6xinmthxulhvx@beryllium.lan> <20201027100049.xtkmjqdwkn7zec2f@linutronix.de> <20201027102547.y6wop7j2ovzg2tyx@beryllium.lan> <20201027102851.gizepjlu4opensqb@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201027102851.gizepjlu4opensqb@linutronix.de> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Oct 27, 2020 at 11:28:51AM +0100, Sebastian Andrzej Siewior wrote: > Is it running as a RT task? root@c2d:~/rt-tests# ./pi_stress Starting PI Stress Test Number of thread groups: 1 Duration of test run: infinite Number of inversions per group: unlimited Admin thread SCHED_FIFO priority 4 1 groups of 3 threads will be created High thread SCHED_FIFO priority 3 Med thread SCHED_FIFO priority 2 Low thread SCHED_FIFO priority 1 It says so, let me double check if those task really run with SCHED_FIFO. > Do you have RCU-boosting enabled? Yes # # RCU Subsystem # CONFIG_TREE_RCU=y CONFIG_PREEMPT_RCU=y CONFIG_RCU_EXPERT=y CONFIG_SRCU=y CONFIG_TREE_SRCU=y CONFIG_TASKS_RCU_GENERIC=y CONFIG_TASKS_RCU=y CONFIG_TASKS_RUDE_RCU=y CONFIG_RCU_STALL_COMMON=y CONFIG_RCU_NEED_SEGCBLIST=y CONFIG_RCU_FANOUT=64 CONFIG_RCU_FANOUT_LEAF=16 CONFIG_RCU_BOOST=y CONFIG_RCU_BOOST_DELAY=500 CONFIG_RCU_NOCB_CPU=y # CONFIG_TASKS_TRACE_RCU_READ_MB is not set # end of RCU Subsystem > Otherwise it looks that if you throw enough non-RT load on the system, > RCU can not catch up which does not sound good. I think this is what Clark tried to tell me. If I understood him correctly the test tool is not correct though.