From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Bonzini Subject: Re: [PATCH RFC] kvm: x86: add halt_poll module parameter Date: Thu, 05 Feb 2015 20:18:40 +0100 Message-ID: <54D3C210.8030108@redhat.com> References: <1423152325-5094-1-git-send-email-pbonzini@redhat.com> <20150205175344.GB14367@potion.redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, riel@redhat.com, mtosatti@redhat.com To: =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= Return-path: In-Reply-To: <20150205175344.GB14367@potion.redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org On 05/02/2015 18:53, Radim Kr=C4=8Dm=C3=A1=C5=99 wrote: > > 99% of what you get if you use idle=3Dpoll in the guest. >=20 > (Hm, I would have thought that this can outperform idle=3Dpoll ...) It outperforms idle=3Dpoll in the host. A vmexit is probably too cheap= to outperform having idle=3Dpoll in the guest. Paolo