From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tomasz Chmielewski Subject: 0.11: SMP guests using one host CPU only? Date: Tue, 20 Oct 2009 11:03:59 +0200 Message-ID: <4ADD7CFF.1080003@wpkg.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit To: kvm@vger.kernel.org Return-path: Received: from mx03.syneticon.net ([78.111.66.105]:56902 "EHLO mx03.syneticon.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751335AbZJTJEU (ORCPT ); Tue, 20 Oct 2009 05:04:20 -0400 Received: from localhost (filter1.syneticon.net [192.168.113.83]) by mx03.syneticon.net (Postfix) with ESMTP id 2E27036032 for ; Tue, 20 Oct 2009 11:04:05 +0200 (CEST) Received: from mx03.syneticon.net ([192.168.113.84]) by localhost (mx03.syneticon.net [192.168.113.83]) (amavisd-new, port 10025) with ESMTP id NN1L3xrqMP+c for ; Tue, 20 Oct 2009 11:03:59 +0200 (CEST) Received: from [192.168.10.145] (koln-4db48e5c.pool.mediaWays.net [77.180.142.92]) by mx03.syneticon.net (Postfix) with ESMTPSA for ; Tue, 20 Oct 2009 11:03:59 +0200 (CEST) Sender: kvm-owner@vger.kernel.org List-ID: On a 8 CPU host, I created a guest with 4 CPUs (-smp 4). Unfortunately, the guest only uses one host CPU. For example, running "cat /dev/urandom | gzip -9 >/dev/null &" several times on this guest causes load on only one host CPU. Is it expected? The host is running 2.6.32-rc5 and qemu-kvm-0.11. I also tried 2.6.31.5 with qemu-kvm-0.11 with the same result. I have another machine, running 2.6.24 kernel, where it works just fine (running several CPU-intensive tasks on a guest result in several host CPUs being loaded). -- Tomasz Chmielewski http://wpkg.org