From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759988AbZEGREO (ORCPT ); Thu, 7 May 2009 13:04:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752460AbZEGRD4 (ORCPT ); Thu, 7 May 2009 13:03:56 -0400 Received: from victor.provo.novell.com ([137.65.250.26]:42301 "EHLO victor.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752223AbZEGRDz (ORCPT ); Thu, 7 May 2009 13:03:55 -0400 Message-ID: <4A031471.7000406@novell.com> Date: Thu, 07 May 2009 13:03:45 -0400 From: Gregory Haskins User-Agent: Thunderbird 2.0.0.21 (Macintosh/20090302) MIME-Version: 1.0 To: Chris Wright CC: Gregory Haskins , Avi Kivity , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Anthony Liguori Subject: Re: [RFC PATCH 0/3] generic hypercall support References: <20090505132005.19891.78436.stgit@dev.haskins.net> <4A0040C0.1080102@redhat.com> <4A0041BA.6060106@novell.com> <4A004676.4050604@redhat.com> <4A0049CD.3080003@gmail.com> <20090505231718.GT3036@sequoia.sous-sol.org> <4A010927.6020207@novell.com> <20090506072212.GV3036@sequoia.sous-sol.org> <4A018DF2.6010301@novell.com> <20090506160712.GW3036@sequoia.sous-sol.org> In-Reply-To: <20090506160712.GW3036@sequoia.sous-sol.org> X-Enigmail-Version: 0.95.7 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig71C38C45EF759E71E8C85249" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig71C38C45EF759E71E8C85249 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Chris Wright wrote: > * Gregory Haskins (ghaskins@novell.com) wrote: > =20 >> Chris Wright wrote: >> =20 >>> VF drivers can also have this issue (and typically use mmio). >>> I at least have a better idea what your proposal is, thanks for >>> explanation. Are you able to demonstrate concrete benefit with it ye= t >>> (improved latency numbers for example)? >>> =20 >> I had a test-harness/numbers for this kind of thing, but its a bit >> crufty since its from ~1.5 years ago. I will dig it up, update it, an= d >> generate/post new numbers. >> =20 > > That would be useful, because I keep coming back to pio and shared > page(s) when think of why not to do this. Seems I'm not alone in that.= > > thanks, > -chris > =20 I completed the resurrection of the test and wrote up a little wiki on the subject, which you can find here: http://developer.novell.com/wiki/index.php/WhyHypercalls Hopefully this answers Chris' "show me the numbers" and Anthony's "Why reinvent the wheel?" questions. I will include this information when I publish the updated v2 series with the s/hypercall/dynhc changes. Let me know if you have any questions. -Greg --------------enig71C38C45EF759E71E8C85249 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.11 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkoDFHEACgkQlOSOBdgZUxke6wCeIQUvbV4FXRQCFLmJRNO5aUjM HxsAnAny6yKoX5oMqCxSn+4QQWKx+uyD =PIrW -----END PGP SIGNATURE----- --------------enig71C38C45EF759E71E8C85249--