From mboxrd@z Thu Jan 1 00:00:00 1970 From: Todd And Margo Chester Subject: What are the rules for hyperthreaded CPUs? Date: Sun, 04 Dec 2011 16:41:03 -0800 Message-ID: <4EDC131F.5070905@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit To: kvm@vger.kernel.org Return-path: Received: from mail-gy0-f174.google.com ([209.85.160.174]:39579 "EHLO mail-gy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755870Ab1LEAlJ (ORCPT ); Sun, 4 Dec 2011 19:41:09 -0500 Received: by ghrr1 with SMTP id r1so4008833ghr.19 for ; Sun, 04 Dec 2011 16:41:09 -0800 (PST) Sender: kvm-owner@vger.kernel.org List-ID: Hi All, My host has an i7-960 processor (4 cores, 8 hypterthreaded cores.) /proc/cpuinfo on my host shows 8 processors. On my Fedora Core 16 guest, /proc/cpuinfo shows 4 processors. Question: what is the maximum number of processors I can assign to my guest? 4 or 8? What are the rules for Hyperthreading? Many thanks, -T