From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gregory Haskins Subject: Re: [PATCH 4/7] vbus-proxy: add a pci-to-vbus bridge Date: Fri, 07 Aug 2009 14:25:50 -0400 Message-ID: <4A7C71AE.7040208@novell.com> References: <20090803171030.17268.26962.stgit@dev.haskins.net> <200908061903.05083.arnd@arndb.de> <4A7B0D090200005A00051D2E@sinclair.provo.novell.com> <200908070057.54795.arnd@arndb.de> <4A7B78580200005A00051D50@sinclair.provo.novell.com> <20090807155500.GB12561@ovro.caltech.edu> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig4AE6142523011E2E1369726E" Cc: Arnd Bergmann , alacrityvm-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, netdev@vger.kernel.org To: "Ira W. Snyder" Return-path: Received: from victor.provo.novell.com ([137.65.250.26]:48865 "EHLO victor.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755000AbZHGSZ4 (ORCPT ); Fri, 7 Aug 2009 14:25:56 -0400 In-Reply-To: <20090807155500.GB12561@ovro.caltech.edu> Sender: netdev-owner@vger.kernel.org List-ID: This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig4AE6142523011E2E1369726E Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Ira W. Snyder wrote: > With my powerpc hardware, it should be easily possible to have at least= > 6 devices, each with two virtqueues, one for tx and one for rx. (The > limit is caused by the amount of distinct kick() events I can generate.= ) > This could allow many combinations of devices, such as: >=20 > * 1 virtio-net, 1 virtio-console > * 3 virtio-net, 2 virtio-console > * 6 virtio-net > * etc. Note that the vbus "connector" design abstract details such as kick events, so you are not limited by the number of physical interrupts of your hardware, per se. You can actually have an arbitrary width namespace for your virtqueues running over a single interrupt, if you were so inclined. (Note you can also have a 1:1 with interrupts if you like, too) If you look at the design of the vbus-pcibridge connector, it actually aggregates the entire namespace into between 1 and 8 interrupts (depending on availability, and separated by priority level). If multiple vectors are not available, the entire protocol can fallback to run over a single vector when necessary. Kind Regards, -Greg --------------enig4AE6142523011E2E1369726E 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/ iEYEARECAAYFAkp8ca4ACgkQP5K2CMvXmqGNJgCfZ0jVCQv68+DLT4Z1aHUeSRtz B50AnAhC/m+CJb6+cR7OUHiHUrSbAHg8 =0kNg -----END PGP SIGNATURE----- --------------enig4AE6142523011E2E1369726E--