From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Bonzini Subject: Re: [QEMU patch 2/2] kvm: allow configuration of tsc deadline timer advancement Date: Wed, 10 Dec 2014 18:09:19 +0100 Message-ID: <54887E3F.4030904@redhat.com> References: <20141210162317.370733848@amt.cnet> <20141210162420.218207164@amt.cnet> <54887C61.80008@redhat.com> <20141210170405.GA19952@amt.cnet> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org, qemu-devel@nongnu.org, Luiz Capitulino , Rik van Riel To: Marcelo Tosatti Return-path: Received: from mx1.redhat.com ([209.132.183.28]:33292 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932268AbaLJR3f (ORCPT ); Wed, 10 Dec 2014 12:29:35 -0500 In-Reply-To: <20141210170405.GA19952@amt.cnet> Sender: kvm-owner@vger.kernel.org List-ID: On 10/12/2014 18:04, Marcelo Tosatti wrote: >> Please add an object property to the x86 CPU object. It can then be >> configured with "-global" on the command line. > > Don't want to allow individual values for different CPUs. > It is a per-VM property. Why? It can cause busy waiting, it would make sense to make it stricter for realtime CPUs and leave 0 for non-realtime CPUs. Paolo From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:48660) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Xyl54-0005li-6E for qemu-devel@nongnu.org; Wed, 10 Dec 2014 12:29:50 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Xyl4x-0004lt-RG for qemu-devel@nongnu.org; Wed, 10 Dec 2014 12:29:42 -0500 Received: from mx1.redhat.com ([209.132.183.28]:38873) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Xyl4x-0004lZ-Kv for qemu-devel@nongnu.org; Wed, 10 Dec 2014 12:29:35 -0500 Message-ID: <54887E3F.4030904@redhat.com> Date: Wed, 10 Dec 2014 18:09:19 +0100 From: Paolo Bonzini MIME-Version: 1.0 References: <20141210162317.370733848@amt.cnet> <20141210162420.218207164@amt.cnet> <54887C61.80008@redhat.com> <20141210170405.GA19952@amt.cnet> In-Reply-To: <20141210170405.GA19952@amt.cnet> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [QEMU patch 2/2] kvm: allow configuration of tsc deadline timer advancement List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Marcelo Tosatti Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org, Luiz Capitulino On 10/12/2014 18:04, Marcelo Tosatti wrote: >> Please add an object property to the x86 CPU object. It can then be >> configured with "-global" on the command line. > > Don't want to allow individual values for different CPUs. > It is a per-VM property. Why? It can cause busy waiting, it would make sense to make it stricter for realtime CPUs and leave 0 for non-realtime CPUs. Paolo