Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753097AbbBETSs (ORCPT ); Thu, 5 Feb 2015 14:18:48 -0500 Received: from mail-we0-f173.google.com ([74.125.82.173]:43867 "EHLO mail-we0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751519AbbBETSq (ORCPT ); Thu, 5 Feb 2015 14:18:46 -0500 Message-ID: <54D3C210.8030108@redhat.com> Date: Thu, 05 Feb 2015 20:18:40 +0100 From: Paolo Bonzini User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0 MIME-Version: 1.0 To: =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= CC: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, riel@redhat.com, mtosatti@redhat.com Subject: Re: [PATCH RFC] kvm: x86: add halt_poll module parameter References: <1423152325-5094-1-git-send-email-pbonzini@redhat.com> <20150205175344.GB14367@potion.redhat.com> In-Reply-To: <20150205175344.GB14367@potion.redhat.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 555 Lines: 16 On 05/02/2015 18:53, Radim Krčmář wrote: > > 99% of what you get if you use idle=poll in the guest. > > (Hm, I would have thought that this can outperform idle=poll ...) It outperforms idle=poll in the host. A vmexit is probably too cheap to outperform having idle=poll in the guest. Paolo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/