From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gregory Haskins Subject: Re: [RFC PATCH 0/3] generic hypercall support Date: Fri, 08 May 2009 10:15:37 -0400 Message-ID: <4A043E89.90403@novell.com> References: <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> <4A031471.7000406@novell.com> <20090507233503.GA9103@amt.cnet> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig2AE78BB1D74339238338E4A4" Cc: Chris Wright , Gregory Haskins , Avi Kivity , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Anthony Liguori To: Marcelo Tosatti Return-path: Received: from victor.provo.novell.com ([137.65.250.26]:58763 "EHLO victor.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751695AbZEHOPx (ORCPT ); Fri, 8 May 2009 10:15:53 -0400 In-Reply-To: <20090507233503.GA9103@amt.cnet> Sender: kvm-owner@vger.kernel.org List-ID: This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig2AE78BB1D74339238338E4A4 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Marcelo Tosatti wrote: > On Thu, May 07, 2009 at 01:03:45PM -0400, Gregory Haskins wrote: > =20 >> Chris Wright wrote: >> =20 >>> * Gregory Haskins (ghaskins@novell.com) wrote: >>> =20 >>> =20 >>>> Chris Wright wrote: >>>> =20 >>>> =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 = yet >>>>> (improved latency numbers for example)? >>>>> =20 >>>>> =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, = and >>>> generate/post new numbers. >>>> =20 >>>> =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 tha= t. >>> >>> thanks, >>> -chris >>> =20 >>> =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. >> =20 > > Greg, > > I think comparison is not entirely fair. FYI: I've update the test/wiki to (hopefully) address your concerns. http://developer.novell.com/wiki/index.php/WhyHypercalls Regards, -Greg --------------enig2AE78BB1D74339238338E4A4 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 iEYEARECAAYFAkoEPokACgkQlOSOBdgZUxkyaACeLJs4ACwZc9smJhpBfOjn720/ QuAAnjguH+2sRz0cmcCjQRinkinGxXI+ =MsJy -----END PGP SIGNATURE----- --------------enig2AE78BB1D74339238338E4A4--