From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Bonzini Subject: Re: [PATCH] KVM: add KVM_CAP_VMX_APICV to advertise hardware apic-v support Date: Thu, 18 Dec 2014 10:23:44 +0100 Message-ID: <54929D20.60505@redhat.com> References: <1418285221-14256-1-git-send-email-zhang.zhanghailiang@huawei.com> <548993D8.6010004@huawei.com> <5489D13B.3000703@redhat.com> <5914325.jABlNffIti@k> <54924BE2.7070806@huawei.com> <54929097.4000806@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Cc: zhanghailiang , hangaohuai@huawei.com, kvm@vger.kernel.org, gleb@kernel.org, peter.huangpeng@huawei.com To: Stefan Fritsch Return-path: Received: from mail-wg0-f43.google.com ([74.125.82.43]:62812 "EHLO mail-wg0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750983AbaLRJXt (ORCPT ); Thu, 18 Dec 2014 04:23:49 -0500 Received: by mail-wg0-f43.google.com with SMTP id l18so1050154wgh.16 for ; Thu, 18 Dec 2014 01:23:48 -0800 (PST) In-Reply-To: Sender: kvm-owner@vger.kernel.org List-ID: On 18/12/2014 09:57, Stefan Fritsch wrote: > I think setting the "recommended" bits to be best for the host where the > VM is first started should always be ok. When it migrates to a different > host, performance may not be optimal but otherwise it will work just fine. > After all, non-optimal performance is not different from the current > situation. What if, due to a bug, a guest mysteriously starts failing on some hosts of a cluster but not others? This is really not a path you want to walk down. Paolo