From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751743AbcGMMeN (ORCPT ); Wed, 13 Jul 2016 08:34:13 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:38445 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751582AbcGMMeG (ORCPT ); Wed, 13 Jul 2016 08:34:06 -0400 Date: Wed, 13 Jul 2016 14:33:37 +0200 From: Peter Zijlstra To: Henrique de Moraes Holschuh Cc: Ingo Molnar , "H. Peter Anvin" , paulmck@linux.vnet.ibm.com, tglx@linutronix.de, mingo@elte.hu, ak@linux.intel.com, linux-kernel@vger.kernel.org Subject: Re: Odd performance results Message-ID: <20160713123337.GY30909@twins.programming.kicks-ass.net> References: <20160710042639.GA4068@linux.vnet.ibm.com> <7DF218CD-22F6-4E46-A628-2138AEA3A161@infradead.org> <20160710144327.GX4650@linux.vnet.ibm.com> <20160712145551.GU30909@twins.programming.kicks-ass.net> <20160712150529.GN7094@linux.vnet.ibm.com> <27d2c710-479d-77a9-f2c6-875e9c2bc40f@zytor.com> <20160712185120.GX30909@twins.programming.kicks-ass.net> <20160713071817.GC13006@gmail.com> <20160713122748.GC20253@khazad-dum.debian.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160713122748.GC20253@khazad-dum.debian.net> 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 Wed, Jul 13, 2016 at 09:27:48AM -0300, Henrique de Moraes Holschuh wrote: > On Wed, 13 Jul 2016, Ingo Molnar wrote: > > > The ordering Paul has, namely 0,1 for core0,smt{0,1} is not something > > > I've ever seen on an Intel part. AMD otoh does enumerate their CMT stuff > > > like what Paul has. > > > > That's more the natural 'direct' mapping from CPU internal topology to CPU id: > > what's close to each other physically is close to each other in the CPU id space > > as well. > > But does it correctly reflect the hardware? That seems to be the real > question... Its just enumeration afaict. But its weird that this changed. Some BIOS team somewhere changed things and I want to know why (and how widespread this is).