From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261506AbUBBXhl (ORCPT ); Mon, 2 Feb 2004 18:37:41 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262425AbUBBXhl (ORCPT ); Mon, 2 Feb 2004 18:37:41 -0500 Received: from www1.proofpoint.com ([207.111.236.2]:28402 "EHLO mail.us.proofpoint.com") by vger.kernel.org with ESMTP id S261506AbUBBXhj (ORCPT ); Mon, 2 Feb 2004 18:37:39 -0500 Subject: broken maxcpus in 2.4.24 From: Dan Christian To: linux-kernel@vger.kernel.org Content-Type: text/plain Message-Id: <1075765034.17943.79.camel@reactor.us.proofpoint.com> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.5 (1.4.5-1) Date: Mon, 02 Feb 2004 15:37:14 -0800 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Score: mlxscore=0 adultscore=50 adjust=0 score=0 rule=notspam version=2.0.0-04012200 mlxdetails="spam=0.00152511832388382,adult=0.5,sa=0" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org I compiled a vanilla 2.4.24 for a 2 processor Xeon. I set CONFIG_NR_CPUS to 4 (2 CPUs x 2 hyperthreads each). When I boot the kernel, /proc/cpuinfo only shows 2 cpus (0-1) and performance is bad. I reconfigure CONFIG_NR_CPUS back to 32. Now it shows 4 cpus (0-3) and performance is normal. Is this a bug or am misunderstanding how to set this configuration variable? -Dan Christian