Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1031993Ab0B1UKU (ORCPT ); Sun, 28 Feb 2010 15:10:20 -0500 Received: from smtp1.linux-foundation.org ([140.211.169.13]:55092 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1031966Ab0B1UKT (ORCPT ); Sun, 28 Feb 2010 15:10:19 -0500 Date: Sun, 28 Feb 2010 12:09:46 -0800 (PST) From: Linus Torvalds X-X-Sender: torvalds@localhost.localdomain To: Ingo Molnar cc: linux-kernel@vger.kernel.org, "H. Peter Anvin" , Thomas Gleixner , Borislav Petkov , Andrew Morton Subject: Re: [GIT PULL] x86/cpu changes for v2.6.34 In-Reply-To: <20100227150942.GA6394@elte.hu> Message-ID: References: <20100227150942.GA6394@elte.hu> User-Agent: Alpine 2.00 (LFD 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2418 Lines: 60 I haven't bisected this, but something slowed down in bootup on my machine recently. See the timestamps: [ 0.000000] Linux version 2.6.33-01832-g30ff056 ... [ 0.010066] Enabled Interrupt-remapping [ 0.010120] Setting APIC routing to physical flat [ 0.010180] DRHD: handling fault status reg 2 [ 0.010582] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1 [ 0.049955] CPU0: Genuine Intel(R) CPU 000 @ 3.20GHz stepping 04 [ 0.157195] Booting Node 0, Processors #1 [ 0.245179] CPU 1 MCA banks CMCI:2 CMCI:3 CMCI:5 SHD:6 SHD:8 [ 0.265332] #2 [ 0.353185] CPU 2 MCA banks CMCI:2 CMCI:3 CMCI:5 SHD:6 SHD:8 [ 0.373328] #3 [ 2.193277] CPU 3 MCA banks CMCI:2 CMCI:3 CMCI:5 SHD:6 SHD:8 [ 2.213379] #4 [ 2.301283] CPU 4 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8 [ 2.321391] #5 [ 2.417287] CPU 5 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8 [ 2.437356] #6 [ 2.525293] CPU 6 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8 [ 2.545354] #7 [ 2.633298] CPU 7 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8 [ 2.653423] Brought up 8 CPUs [ 2.653571] Total of 8 processors activated (51201.44 BogoMIPS). what happened there for almost 2 seconds in between CPU#3 and CPU#4? It wasn't very fast before either, but it was way better: [ 0.050298] CPU0: Genuine Intel(R) CPU 000 @ 3.20GHz stepping 04 [ 0.156725] Booting Node 0, Processors #1 [ 0.244410] CPU 1 MCA banks CMCI:2 CMCI:3 CMCI:5 SHD:6 SHD:8 [ 0.264458] #2 [ 0.352078] CPU 2 MCA banks CMCI:2 CMCI:3 CMCI:5 SHD:6 SHD:8 [ 0.372147] #3 [ 0.459746] CPU 3 MCA banks CMCI:2 CMCI:3 CMCI:5 SHD:6 SHD:8 [ 0.479838] #4 [ 0.567415] CPU 4 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8 [ 0.587446] #5 [ 0.683057] CPU 5 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8 [ 0.703081] #6 [ 0.790724] CPU 6 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8 [ 0.810748] #7 [ 0.898393] CPU 7 MCA banks SHD:2 SHD:3 SHD:5 SHD:6 SHD:8 [ 0.918412] Brought up 8 CPUs [ 0.918562] Total of 8 processors activated (51203.34 BogoMIPS). what is it that takes so long to bring those CPU's up? Linus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/