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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0454BC433EF for ; Thu, 30 Sep 2021 23:40:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C6AB561A59 for ; Thu, 30 Sep 2021 23:40:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1349685AbhI3XmQ (ORCPT ); Thu, 30 Sep 2021 19:42:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50448 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348832AbhI3XmP (ORCPT ); Thu, 30 Sep 2021 19:42:15 -0400 Received: from mail-pj1-x1029.google.com (mail-pj1-x1029.google.com [IPv6:2607:f8b0:4864:20::1029]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 61FFFC06176A for ; Thu, 30 Sep 2021 16:40:32 -0700 (PDT) Received: by mail-pj1-x1029.google.com with SMTP id om12-20020a17090b3a8c00b0019eff43daf5so5959397pjb.4 for ; Thu, 30 Sep 2021 16:40:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:references:date:in-reply-to:message-id :user-agent:mime-version; bh=c3ZJkBoC6jGSqEGAGeDjBKeXBWcQfhkojnW+Xo8j8XI=; b=CM80o18giomJfRpzl8DSoxl+P4oe1sXNgcKVIOu6wnShkaVXSfdC2ikrZf/lAdlSEr eIPQN6ltMFY5vhb140DlWmN16jjxgoRUQNNXRNs1WNEEziHxq4ZrD+OwSrjLQ8XDJE1f wV+GiT2ThkTWKoPDdZnWP5VH0X7+8hM6gdNmMVYGDR9oa/TqEwhG4F71vivcLHD7rolW d9drvemITK6HjBGycBVR+U6hEdU294XmyRC7+zpxY+R5wftn74bXJgLJSXYhxH2y+MQ0 WnDDorAWpPGMsMSAE0ANsMmlBhmM+JFJ+cBStY+K+6llxNQ2TLtStYimu+ydgH9EsWMa 3/Hg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:references:date:in-reply-to :message-id:user-agent:mime-version; bh=c3ZJkBoC6jGSqEGAGeDjBKeXBWcQfhkojnW+Xo8j8XI=; b=X8YQbZ/uRTjLZqZmpS3ubxgYE5Y2Br45qHG5MYy8LCVmBQJkF/yPGPtgSc/O938N+o 3tL0r9OPLhqwMLCPmUXd3Z5aPGAkDeugoD5yC+2++b5C4GKyOWWqItKgXhT7av671/YH /nCQ3UWWHCF8NqLM7IV2UGLBqnwXBh/DCFOYAAsxA49+8TleQpQvJGSmakGvkBRnosZu A8IUvWOhjScj1PwgKtc2Z5xVttk0BHNA69N2UL3CjKbGaH6odxdOY/hhfxXTltMtTwxS bOKUrei9HSzi5pATzGzq2XEwyXQvwA+jTXavP76uzRH6+UDCBgOZ2DXpxH89cCpWulAF FJjg== X-Gm-Message-State: AOAM532dmj4B0kTGJqsRZ5H3KLh9UzGSDWqSQ1UmCLR+AKavR4BN333x SCd7mb5wi4WytDLXHKHr5Bw= X-Google-Smtp-Source: ABdhPJyXtMv0nk8o2hPFCjD0xLGWSE0EkTSzi+8JAT+d/66TEyd4w2zZPu6m0c8WB65yct0zCPCI9A== X-Received: by 2002:a17:902:c3c5:b0:13e:31a6:c1c7 with SMTP id j5-20020a170902c3c500b0013e31a6c1c7mr6735722plj.62.1633045231677; Thu, 30 Sep 2021 16:40:31 -0700 (PDT) Received: from localhost (122x211x248x161.ap122.ftth.ucom.ne.jp. [122.211.248.161]) by smtp.gmail.com with ESMTPSA id a10sm3930399pfn.48.2021.09.30.16.40.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Sep 2021 16:40:31 -0700 (PDT) From: Punit Agrawal To: Pierre FICHEUX Cc: Sebastian Andrzej Siewior , Clark Williams , John Kacur , linux-rt-users@vger.kernel.org, Thomas Gleixner Subject: Re: Strange problem with PREEMPT_RT References: <87y27e53a2.fsf@stealth> <20210930132319.eixnv6rb66ui6x6j@linutronix.de> <20210930135145.mdlzzwp64yykixhx@linutronix.de> Date: Fri, 01 Oct 2021 08:40:25 +0900 In-Reply-To: (Pierre FICHEUX's message of "Thu, 30 Sep 2021 16:31:25 +0200") Message-ID: <871r554opi.fsf@stealth> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-rt-users@vger.kernel.org Please don't top-post[0] - it makes it harder to reply with context from previous emails. Kernel related mailing lists tend to prefer bottom-posting[1]. Pierre FICHEUX writes: > # cpupower -c all idle-info > CPUidle driver: none > CPUidle governor: menu > analyzing CPU 0: > > CPU 0: No idle states > ... > same for all cpus. It looks like cpuidle may not be to blame for your woes. One last thing to check regarding idle (call me paranoid) would be to see if there's an option to disable C-states in bios. Not being familiar with your system, it would be useful to rule out any firmware driven idle management. Barring that, maybe look into upgrading to a newer kernel if possible. [0] https://en.wikipedia.org/wiki/Posting_style#Top-posting [1] https://en.wikipedia.org/wiki/Posting_style#Bottom-posting [...]