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=-3.8 required=3.0 tests=BAYES_00, 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 4BE7DC4363A for ; Tue, 27 Oct 2020 10:36:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0597B22264 for ; Tue, 27 Oct 2020 10:36:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2898455AbgJ0KgA (ORCPT ); Tue, 27 Oct 2020 06:36:00 -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) 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-rt-users@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.