From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gregory Haskins Subject: Re: AlacrityVM benchmark numbers updated Date: Wed, 26 Aug 2009 16:05:57 -0400 Message-ID: <4A9595A5.9060809@gmail.com> References: <4A948962.7090909@gmail.com> <4A950B75.5020409@redhat.com> <4A95822D.9060207@gmail.com> <4A958BA0.2000801@redhat.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig8FC4678BFD16BC9A0DD9C085" Cc: alacrityvm-devel@lists.sourceforge.net, "linux-kernel@vger.kernel.org" , "kvm@vger.kernel.org" , "Michael S. Tsirkin" , netdev@vger.kernel.org To: Avi Kivity Return-path: Received: from mail-pz0-f192.google.com ([209.85.222.192]:45629 "EHLO mail-pz0-f192.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753207AbZHZUGC (ORCPT ); Wed, 26 Aug 2009 16:06:02 -0400 In-Reply-To: <4A958BA0.2000801@redhat.com> Sender: netdev-owner@vger.kernel.org List-ID: This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig8FC4678BFD16BC9A0DD9C085 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Avi Kivity wrote: > On 08/26/2009 09:42 PM, Gregory Haskins wrote: >> Actually, I have already look at this and it does indeed seem better t= o >> use switch_mm+gupf() over gup() by quite a large margin. You could th= en >> couple that with your DMA-engine idea to potentially gain even more >> benefits (though probably not for networking since most NICs have thei= r >> own DMA engine anyway). >> >> =20 >=20 > For tx, we'll just go copyless once we plumb the destructors properly. = > But for rx on a shared interface it is impossible to avoid the copy.=20 > You can only choose if you want it done by the cpu or a local dma engin= e. >=20 >=20 Yep, agree on both counts. -Greg --------------enig8FC4678BFD16BC9A0DD9C085 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/ iEYEARECAAYFAkqVlaUACgkQP5K2CMvXmqHoFwCfek8O5cudY+AaXCFINZG7xkl+ 7KQAniST0CkgR/J/DWuiquv3L0y3x+oo =YzEV -----END PGP SIGNATURE----- --------------enig8FC4678BFD16BC9A0DD9C085--