From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dave Jones Subject: Re: Problem with 2.5.38 recognizing all CPUs ? Date: Tue, 1 Oct 2002 20:21:36 +0200 Sender: linux-smp-owner@vger.kernel.org Message-ID: <20021001202136.B22659@suse.de> References: Mime-Version: 1.0 Return-path: Content-Disposition: inline In-Reply-To: ; from burceam@eecg.toronto.edu on Tue, Oct 01, 2002 at 02:18:49PM -0400 List-Id: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Mihai Burcea Cc: linux-smp@vger.kernel.org On Tue, Oct 01, 2002 at 02:18:49PM -0400, Mihai Burcea wrote: > > Hi, > > I have the following problem: I have a PE6600 Xeon machine, 8 CPUs with > the HyperThreading tech. Running a Linux RedHat 7.3, 2.4.18-4smp kernel > on it, makes it recognize that there are 8 CPUs in the system. > After I have installed 2.5.38, it only notices there are 4 CPUs in the > system. > > Now the 2.5.x kernel may indeed report 4 CPUs because it's really really > smart and knows it all about the HT technology, but it should still at > least give me access to all 8 of the CPUs, I'd reckon. However, I doubt > that this is the case. > > I would like to know whether anyone else has confronted with a similar > problem, or any feedback at all. Indeed, the behaviour should be no different (as long as your 2.5 kernel was also built with CONFIG_SMP=y) Can you post a dmesg output from both kernels ? Dave -- | Dave Jones. http://www.codemonkey.org.uk