Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263915AbTFJU5O (ORCPT ); Tue, 10 Jun 2003 16:57:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262569AbTFJUzy (ORCPT ); Tue, 10 Jun 2003 16:55:54 -0400 Received: from mailrelay2.lanl.gov ([128.165.4.103]:26071 "EHLO mailrelay2.lanl.gov") by vger.kernel.org with ESMTP id S263915AbTFJUz3 (ORCPT ); Tue, 10 Jun 2003 16:55:29 -0400 Subject: Re: Wrong number of cpus detected/reported From: Steven Cole To: Samuel Flory Cc: John Appleby , xyko_ig@ig.com.br, linux-kernel@vger.kernel.org In-Reply-To: <3EE64161.5010102@rackable.com> References: <434747C01D5AC443809D5FC540501131569E@bobcat.unickz.com> <3EE64161.5010102@rackable.com> Content-Type: text/plain Organization: Message-Id: <1055279041.2270.42.camel@spc9.esa.lanl.gov> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.2.4-1.1mdk Date: 10 Jun 2003 15:04:01 -0600 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1640 Lines: 55 On Tue, 2003-06-10 at 14:36, Samuel Flory wrote: > John Appleby wrote: > > >>After the upgrade the system is reporting that the machine has 8 cpu > >>instead of 4. I have been looking for some kind of information on the > >>Internet (www.google.com/linux) about that but I didn't have success. > >> > >> > > > >I suspect that it is identifying 4 Xeon CPUs with Hyperthreading, which > >will correctly double the amount of processors your kernel thinks you > >have. Intel's Hyperthreading > > > >This ought to be a good thing... the only thing I don't quite understand > >is that I thought Hyperthreading was added in 2.4.17. > > > > > > > > Red Hat enabled basic hyperthreading support in their 2.4.9 eratta > kernels some where along the line. I just didn't think 1.4 Xeons did > HT. (Maybe the MP Xeons are different from the DP xeons.) His does. From his cpuinfo: processor : 7 vendor_id : GenuineIntel cpu family : 15 model : 1 model name : Intel(R) Xeon(TM) CPU 1.40GHz stepping : 1 cpu MHz : 1399.982 cache size : 256 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm bogomips : 2798.38 See that ht flag near the end? Don't know why he doesn't go with RH 9 or RH AS though. Steven - 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/