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=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 28B20C47404 for ; Wed, 9 Oct 2019 23:01:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E2F4B206BB for ; Wed, 9 Oct 2019 23:01:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731916AbfJIXBB convert rfc822-to-8bit (ORCPT ); Wed, 9 Oct 2019 19:01:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:33978 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731140AbfJIXBB (ORCPT ); Wed, 9 Oct 2019 19:01:01 -0400 From: bugzilla-daemon@bugzilla.kernel.org To: kvm@vger.kernel.org Subject: [Bug 205151] New: "user requested TSC rate below hardware speed" warning Date: Wed, 09 Oct 2019 23:01:00 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: AssignedTo virtualization_kvm@kernel-bugs.osdl.org X-Bugzilla-Product: Virtualization X-Bugzilla-Component: kvm X-Bugzilla-Version: unspecified X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: v.zubkov87@gmail.com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P1 X-Bugzilla-Assigned-To: virtualization_kvm@kernel-bugs.osdl.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version cf_kernel_version rep_platform op_sys cf_tree bug_status bug_severity priority component assigned_to reporter cf_regression Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT X-Bugzilla-URL: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated MIME-Version: 1.0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org https://bugzilla.kernel.org/show_bug.cgi?id=205151 Bug ID: 205151 Summary: "user requested TSC rate below hardware speed" warning Product: Virtualization Version: unspecified Kernel Version: 5.3 Hardware: x86-64 OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: kvm Assignee: virtualization_kvm@kernel-bugs.osdl.org Reporter: v.zubkov87@gmail.com Regression: Yes 5.3 seems to have broken TSC, at least for qemu/kvm VMs. After 5.3 upgrade starting a VM gets me "user requested TSC rate below hardware speed" warnings (1 per assigned core). I'm not quite sure when kind of data I could provide, however after a short while (several minutes) drift becomes quite noticable (severe audio/video desync). Relevant(?) dmesg entries from 5.3: [Sun Oct 6 16:59:21 2019] tsc: Detected 4000.000 MHz processor [Sun Oct 6 16:59:21 2019] tsc: Detected 3999.984 MHz TSC [Sun Oct 6 16:59:22 2019] tsc: Refined TSC clocksource calibration: 4008.064 MHz [Sun Oct 6 17:00:48 2019] user requested TSC rate below hardware speed [Sun Oct 6 17:00:48 2019] user requested TSC rate below hardware speed And 5.2: [Thu Oct 3 21:56:01 2019] tsc: Detected 4000.000 MHz processor [Thu Oct 3 21:56:01 2019] tsc: Detected 4008.000 MHz TSC (no refined calibration here) My CPU is Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz (family: 0x6, model: 0x5e, stepping: 0x3). Revering commit 604dc9170f2435d27da5039a3efd757dceadc684 fixes the problem. -- You are receiving this mail because: You are watching the assignee of the bug.