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=-2.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 DDD68C32771 for ; Fri, 24 Jan 2020 15:54:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B56F520838 for ; Fri, 24 Jan 2020 15:54:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="ORo8l2ZP" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389354AbgAXPyt (ORCPT ); Fri, 24 Jan 2020 10:54:49 -0500 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:50314 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2389209AbgAXPys (ORCPT ); Fri, 24 Jan 2020 10:54:48 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1579881287; 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=NVWDSNWG2YBJMb5h9YSxyXIldji6NzcE4XoLI2HHWzc=; b=ORo8l2ZPHj7RLVaazQFnFG0u98y4Y8jUhaOZPdiLFSvQZ8aipGGzusazUbPNoZxyHEJahy 17Swyz7ak1l6M4hMj007+esD0o/13h14YSVNPGzX5GMX1OBM3Gx09YYdntlOD+1XMf4/tt LDxfolWF6XPs5ZmpkF6eDYZNcmD+0o8= Received: from mail-wm1-f70.google.com (mail-wm1-f70.google.com [209.85.128.70]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-266-Rn31XxhbPLCIpzU07dHnew-1; Fri, 24 Jan 2020 10:54:45 -0500 X-MC-Unique: Rn31XxhbPLCIpzU07dHnew-1 Received: by mail-wm1-f70.google.com with SMTP id g26so968971wmk.6 for ; Fri, 24 Jan 2020 07:54:45 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=NVWDSNWG2YBJMb5h9YSxyXIldji6NzcE4XoLI2HHWzc=; b=tnCTnfvQm4lEniotmP0kjler7lxgzfhLsP1DB4uwFxlNJ6kSxj3f+ZD6DkNIiiTnnw 6JsCzuW+wwtOy9aLHQlvyT+laGnoMxNY4uoEigNSQoBR4ap3lqyzlnRKZrFtbWqzsC7d k9H3XFECL5cHkIzhI2GxtGuwk3o7AVDL6oT/hzN5pKIi+wn9FISTf8n/wkR3CYmzpf2Q jS5w5vmgNe6MnqYcxQieu63asdicdnQvXZaCtKXwTsjJ0bg/6VEUB6i7wbm9FX+TtTuB O19bCXxzh7YLd9zwaCjK/59Ao3G+VVjQS2Z2YqlQdeiHUA5bqxvetXSyrsqqxXKfyIlC fZGg== X-Gm-Message-State: APjAAAW+dnAPLIDiUDhLLM7oahRwIe8kGB/EGWPxhZAYoMtWXxFpFzxS nZlkNKn5u5GbVR0Q1zy68AY4cBDOkQy5XW/0PS5KdG1usz0UAKL3ykmcFHqbrQv7fkmfeln3CgA PVn27sNPMIvRcfqf0k8unSaBm X-Received: by 2002:a1c:b4c3:: with SMTP id d186mr4074200wmf.140.1579881284292; Fri, 24 Jan 2020 07:54:44 -0800 (PST) X-Google-Smtp-Source: APXvYqzogXgz6eTRvTJTnIRAJ0NJbB5DE5bi6k5zNhAyU8p2PLfZwHBI0nZO2cDrzJW3xMW3fb0Xdg== X-Received: by 2002:a1c:b4c3:: with SMTP id d186mr4074179wmf.140.1579881284027; Fri, 24 Jan 2020 07:54:44 -0800 (PST) Received: from dhcp-44-196.space.revspace.nl ([2a0e:5700:4:11:6eb:1143:b8be:2b8]) by smtp.gmail.com with ESMTPSA id t12sm7536527wrs.96.2020.01.24.07.54.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 24 Jan 2020 07:54:43 -0800 (PST) Subject: Re: [v3] x86/tsc: Unset TSC_KNOWN_FREQ and TSC_RELIABLE flags on Intel Bay Trail SoC To: Thomas Gleixner , Hans de Goede , Andy Shevchenko , vipul kumar Cc: Daniel Lezcano , linux-kernel@vger.kernel.org, Stable , Srikanth Krishnakar , Cedric Hombourger , x86@kernel.org, Len Brown , Vipul Kumar References: <1579617717-4098-1-git-send-email-vipulk0511@gmail.com> <87eevs7lfd.fsf@nanos.tec.linutronix.de> <878slzeeim.fsf@nanos.tec.linutronix.de> <20200123144108.GU32742@smile.fi.intel.com> <87iml11ccf.fsf@nanos.tec.linutronix.de> <87ftg5131x.fsf@nanos.tec.linutronix.de> From: Hans de Goede Message-ID: <37321319-e110-81f5-2488-cedf000da04d@redhat.com> Date: Fri, 24 Jan 2020 16:54:42 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <87ftg5131x.fsf@nanos.tec.linutronix.de> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, On 1/24/20 12:55 PM, Thomas Gleixner wrote: > Hans, > > Hans de Goede writes: >> On 1/24/20 9:35 AM, Thomas Gleixner wrote: >>> Where does that number come from? Just math? >> >> Yes just math, but perhaps the Intel folks can see if they can find some >> datasheet to back this up ? > > Can you observe the issue on one of the machines in your zoo as well? I haven't tried yet. Looking at the thread sofar the problem was noticed on a system with a Celeron N2930, I don't have access to one of those, I do have access to a system with a closely related N2840 I will give that a try as well as see if I can reproduce this on one of the tablet oriented Z3735x SoCs. I'll report back when I have had a chance to test this. Regards, Hans