From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754806AbcGEINr (ORCPT ); Tue, 5 Jul 2016 04:13:47 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:34810 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754189AbcGEINo (ORCPT ); Tue, 5 Jul 2016 04:13:44 -0400 Date: Tue, 5 Jul 2016 10:13:38 +0200 From: Peter Zijlstra To: Vladimir Panteleev Cc: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , x86@kernel.org, linux-kernel@vger.kernel.org Subject: Re: Subject: PROBLEM: CPU accounting/scheduling regression in v4.6 CPU scheduling patchset? Message-ID: <20160705081338.GW30921@twins.programming.kicks-ass.net> References: <169481048.20160703172411@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <169481048.20160703172411@gmail.com> User-Agent: Mutt/1.5.23.1 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Jul 03, 2016 at 05:24:11PM +0000, Vladimir Panteleev wrote: > dmesg output: > https://dump.v.panteleev.md/b8a3ba608a914a3d70667dad697dddfb/1467563818.log [ 0.059350] smpboot: CPU0: Intel(R) Core(TM) i7-4960X CPU @ 3.60GHz (family: 0x6, model: 0x3e, stepping: 0x4) ... [ 0.069372] x86: Booting SMP configuration: [ 0.069375] .... node #0, CPUs: #1 [ 0.132420] TSC synchronization [CPU#0 -> CPU#1]: [ 0.132427] Measured 170505122558937 cycles TSC warp between CPUs, turning off TSC clock. [ 0.132435] tsc: Marking TSC unstable due to check_tsc_sync_source failed [ 0.136636] #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 [ 0.773136] x86: Booted up 1 node, 12 CPUs How can TSC be borken on single socket IvyBridge !?