From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Bonzini Subject: Re: cpu frequency Date: Tue, 23 Dec 2014 12:37:22 +0100 Message-ID: <549953F2.1040901@redhat.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit To: Nerijus Baliunas , KVM list Return-path: Received: from mail-wg0-f46.google.com ([74.125.82.46]:34217 "EHLO mail-wg0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755074AbaLWLh3 (ORCPT ); Tue, 23 Dec 2014 06:37:29 -0500 Received: by mail-wg0-f46.google.com with SMTP id x13so8873000wgg.33 for ; Tue, 23 Dec 2014 03:37:27 -0800 (PST) In-Reply-To: Sender: kvm-owner@vger.kernel.org List-ID: On 23/12/2014 12:19, Nerijus Baliunas wrote: > Hello, > > A commercial application running on Windows (kvm guest) detects CPU as: > CPU_0: CPU0, Intel64 Family 6 Model 42 Stepping 1, 64, 64, 2200, > 078BFBFD000206A1, 10753, CPU 0 > After some time, without reboot, it detects as: > CPU_0: CPU0, Intel64 Family 6 Model 42 Stepping 1, 64, 64, 2298, > 078BFBFD000206A1, 10753, CPU 0 > > Windows Server 2012 Control Panel -> System shows CPU as 2.3 GHZ, but after > reboot it might show 2.2 or 1.97 GHz. > > The problem is, that commercial application stops working after it detects > CPU frequency change (2200 -> 2298 in above case). Is it possible to patch > qemu-kvm that it shows some constant frquency to the guest? How are you running qemu-kvm? (Command line, or XML if you're using libvirt, or similar). Paolo