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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 573CEC43387 for ; Mon, 14 Jan 2019 10:09:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1E6712086D for ; Mon, 14 Jan 2019 10:09:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726610AbfANKJj (ORCPT ); Mon, 14 Jan 2019 05:09:39 -0500 Received: from mx3.molgen.mpg.de ([141.14.17.11]:41079 "EHLO mx1.molgen.mpg.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726187AbfANKJj (ORCPT ); Mon, 14 Jan 2019 05:09:39 -0500 Received: from keineahnung.molgen.mpg.de (keineahnung.molgen.mpg.de [141.14.17.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pmenzel) by mx.molgen.mpg.de (Postfix) with ESMTPSA id E0B52201353427; Mon, 14 Jan 2019 11:09:35 +0100 (CET) Subject: Re: tsc: Fast TSC calibration failed with AMD B350M/Ryzen 3 2200G To: Thomas Gleixner Cc: x86@kernel.org, LKML References: <9f444c64-c221-e729-7eb5-fc4f093c16d3@molgen.mpg.de> From: Paul Menzel Message-ID: <5656446a-eaef-aa94-8766-49fec24257c6@molgen.mpg.de> Date: Mon, 14 Jan 2019 11:09:35 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms010704050207080301000503" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is a cryptographically signed message in MIME format. --------------ms010704050207080301000503 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable Dear Thomas, On 01/11/19 21:43, Thomas Gleixner wrote: > On Mon, 7 Jan 2019, Paul Menzel wrote: >> On 01/07/19 16:24, Thomas Gleixner wrote: >>>> Linux 4.19.13 from Debian Sid/unstable logs the message below on the= board MSI >>>> MS-7A37/B350M MORTAR with the processor AMD Ryzen 3 2200G. >>>> >>>> As a result, the early time stamps do not seem to be working. >>> >>>>> [ 0.000000] DMI: Micro-Star International Co., Ltd. MS-7A37/B350= M MORTAR (MS-7A37), BIOS 1.I0 11/06/2018 >>>>> [ 0.000000] tsc: Fast TSC calibration failed >>> >>> And the further boot log says: >>> >>> [ 0.036000] tsc: Unable to calibrate against PIT >>> [ 0.036000] tsc: using HPET reference calibration >>> [ 0.036000] tsc: Detected 3500.117 MHz processor >>> >>> So the quick calibration in early boot fails because the PIT seems no= t to >>> do what the kernel expects. Nothing we can cure :( >> >> I see. Can AMD confirm that this is the expected behavior? If yes, sho= uld >> the fast TSC calibration be skipped on these devices? >=20 > It should work and we really don't want to add cpu family/model based > decisions whether we invoke something or not. Those tables are stale be= fore > they hit mainline. Understood. If it=E2=80=99s supposed to work, any hints on how to debug t= his? Does some Linux kernel developers have an AMD Ryzen system, and can repro= duce the issue? It seems to fail with an AMD Ryzen 2400G too [1]. It also fails on an AMD Ryzen 7 1700 [2]. ``` [ 0.000000] Linux version 4.15.0-kali3-amd64 (devel@kali.org) (gcc versio= n 7.3.0 (Debian 7.3.0-16)) #1 SMP Debian 4.15.17-1kali1 (2018-04-25) [=E2=80=A6] [ 0.008000] ..TIMER: vector=3D0x30 apic1=3D0 pin1=3D2 apic2=3D-1 pin2=3D-= 1 [ 0.028000] tsc: Fast TSC calibration failed [ 0.032000] tsc: PIT calibration matches HPET. 1 loops [ 0.032000] tsc: Detected 2994.246 MHz processor [=E2=80=A6] [ 0.044000] smpboot: CPU0: AMD Ryzen 7 1700 Eight-Core Processor (family:= 0x17, model: 0x1, stepping: 0x1) ``` It *works* here on one system with AMD Ryzen 5 PRO 1500 and Linux 4.14.87= =2E ``` [ 0.000000] Linux version 4.14.87.mx64.236 (root@likearollingstone.mol= gen.mpg.de) (gcc version 7.3.0 (GCC)) #1 SMP Mon Dec 10 09:48:57 CET 2018= [=E2=80=A6] [ 0.000000] tsc: Fast TSC calibration using PIT [=E2=80=A6] [ 0.035000] smpboot: CPU0: AMD Ryzen 5 PRO 1500 Quad-Core Processor (f= amily: 0x17, model: 0x1, stepping: 0x1) ``` Kind regards, Paul [1]: 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