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=-0.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 EE97FC433E0 for ; Thu, 28 May 2020 12:06:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D01FE21548 for ; Thu, 28 May 2020 12:06:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389399AbgE1MGe (ORCPT ); Thu, 28 May 2020 08:06:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47962 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389059AbgE1MG2 (ORCPT ); Thu, 28 May 2020 08:06:28 -0400 Received: from Galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CAB29C05BD1E for ; Thu, 28 May 2020 05:06:27 -0700 (PDT) Received: from p5de0bf0b.dip0.t-ipconnect.de ([93.224.191.11] helo=nanos.tec.linutronix.de) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1jeHIg-0006Uf-J5; Thu, 28 May 2020 14:06:18 +0200 Received: by nanos.tec.linutronix.de (Postfix, from userid 1000) id 09E65100D01; Thu, 28 May 2020 14:06:18 +0200 (CEST) From: Thomas Gleixner To: Peter Zijlstra , Paul Menzel Cc: x86@kernel.org, LKML Subject: Re: TSC problems with Acer TravelMate 5735Z In-Reply-To: <20200524185800.GV325280@hirez.programming.kicks-ass.net> References: <20200524185800.GV325280@hirez.programming.kicks-ass.net> Date: Thu, 28 May 2020 14:06:17 +0200 Message-ID: <874ks0p8li.fsf@nanos.tec.linutronix.de> MIME-Version: 1.0 Content-Type: text/plain X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Peter Zijlstra writes: > On Sun, May 24, 2020 at 07:09:18PM +0200, Paul Menzel wrote: >> Dear Linux folks, >> >> >> I got my hands on an old Acer TravelMate 5735Z (Intel GM45/Cantiga) and >> installed Debian Sid/unstable with Linux 5.6.7 on it. >> >> Booting the system it takes a long time, and the systemd units fail to >> start. The logs contain that the TSC is unstable. Adding `tsc=unstable` to >> the Linux kernel command line fixes this. > > It fixes nothing; it just doesn't get you the warning because you told > it upfront. Well, it prevents the kernel to use TSC upfront and not wait until it's discovered to be crap. That might make a difference. Thanks, tglx