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=-3.9 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 7BAA7C388F9 for ; Tue, 27 Oct 2020 11:06:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2926E22258 for ; Tue, 27 Oct 2020 11:06:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="OoSWB6+O"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="JG48Rzr4" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2898932AbgJ0LGP (ORCPT ); Tue, 27 Oct 2020 07:06:15 -0400 Received: from Galois.linutronix.de ([193.142.43.55]:46364 "EHLO galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2898906AbgJ0LGO (ORCPT ); Tue, 27 Oct 2020 07:06:14 -0400 Date: Tue, 27 Oct 2020 12:06:11 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1603796772; 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: in-reply-to:in-reply-to:references:references; bh=LKwuG3DrXp6m8nanJYzu9PsZbU1coOD6Mg4vjT7V584=; b=OoSWB6+OPmLBNFX7jYpbKVjOXMcsyTBsllZQL9hO9HQqFikKi/u9bprFBiIpApxMQ6KYmv Tp343NhP4piJR9uvrCIQVf3H6DzUE9hZK1HdcoICuI3QnohV94efZf3enX1gCmWwLKFVR0 qQYvxNnn9G/po7OU+y3woby/vxZRYwuOfcT5THXkGfEOkZYjApPNyRnSJ5U9QojtNUnewK zPfOnfMbHDyVH1qR7K/nLt8E7inLbhSjYDMU43Y/HxNcA2Q6Y9kzPtLjJPys62LFuZbM/6 JDyEGbiVyM6FaPFvQBKrKTarX/OixUTZV12PsBhpG3YcfAlKfRXgvaOH+FztoQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1603796772; 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: in-reply-to:in-reply-to:references:references; bh=LKwuG3DrXp6m8nanJYzu9PsZbU1coOD6Mg4vjT7V584=; b=JG48Rzr4Mypqi2QL/MZcWUKHzZsH/RXuYm/cPJ3ZnKq6s4F2MgMUALvxnwBkqRSu3F8+Iw uwd29UWLG7KR8HCg== From: Sebastian Andrzej Siewior To: Daniel Wagner Cc: Thomas Gleixner , LKML , linux-rt-users , Steven Rostedt , Clark Williams Subject: Re: [ANNOUNCE] v5.9.1-rt19 Message-ID: <20201027110611.5hvuhsp3sjtcshsl@linutronix.de> References: <20201024091838.gzhn2dlx2j7xnixg@linutronix.de> <20201027093616.5vn6xinmthxulhvx@beryllium.lan> <20201027100049.xtkmjqdwkn7zec2f@linutronix.de> <20201027102547.y6wop7j2ovzg2tyx@beryllium.lan> <20201027102851.gizepjlu4opensqb@linutronix.de> <20201027103411.h5ushvwsrovxls5u@beryllium.lan> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20201027103411.h5ushvwsrovxls5u@beryllium.lan> Precedence: bulk List-ID: X-Mailing-List: linux-rt-users@vger.kernel.org On 2020-10-27 11:34:11 [+0100], Daniel Wagner wrote: > 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. urgh. You wrote pi_stress and I read stress-ng. Okay this explains it. > > 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. a dummy RCU section might help. But otherwise it is correct :/ Sebastian