From: Paul Brook <paul@codesourcery.com>
To: qemu-devel@nongnu.org
Cc: Mark McLoughlin <markmc@redhat.com>,
Anthony Liguori <aliguori@us.ibm.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
Markus Armbruster <armbru@redhat.com>
Subject: Re: [Qemu-devel] Re: [PATCH 9/9] Introduce VLANClientState::cleanup()
Date: Wed, 29 Apr 2009 11:37:56 +0100 [thread overview]
Message-ID: <200904291137.57852.paul@codesourcery.com> (raw)
In-Reply-To: <49F77766.2080309@us.ibm.com>
> > I'm still not understanding. Ethernet devices are fundamentally based
> > around a bus architecture. "flip the TX/RX queues" only makes sense if
> > you're talking about a point-point connection. For ethernet devices I see
> > no reason to distinguish between "host" devices (slirp, vde, tap) and
> > "guest" devices. They may be created for different reasons, but they're
> > all doing fundamentally the same thing.
>
> In the bus model, there's an implicit copy-to-the-wire operation that
> results in replication of the packet to everything else on the bus.
> From a performance perspective, this is not at all ideal.
I'm not convinced by this argument. I don't see why a one-many api requires a
copy.
Paul
next prev parent reply other threads:[~2009-04-29 10:38 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-15 16:29 [Qemu-devel] [PATCH 0/9] Misc networking fixes Mark McLoughlin
2009-04-15 16:29 ` [Qemu-devel] [PATCH 1/9] Remove stray GSO code from virtio_net Mark McLoughlin
2009-04-15 16:29 ` [Qemu-devel] [PATCH 2/9] struct iovec is now universally available Mark McLoughlin
2009-04-15 16:29 ` [Qemu-devel] [PATCH 3/9] Fix error handling in net_client_init() Mark McLoughlin
2009-04-15 16:29 ` [Qemu-devel] [PATCH 4/9] Don't fail PCI hotplug if no NIC model is supplied Mark McLoughlin
2009-04-15 16:29 ` [Qemu-devel] [PATCH 5/9] Remove some useless malloc() checking Mark McLoughlin
2009-04-15 16:29 ` [Qemu-devel] [PATCH 6/9] Remove NICInfo from e1000 and mipsnet state Mark McLoughlin
2009-04-15 16:29 ` [Qemu-devel] [PATCH 7/9] Add unregister_savevm() Mark McLoughlin
2009-04-15 16:29 ` [Qemu-devel] [PATCH 8/9] Use NICInfo::model for eepro100 savevm ID string Mark McLoughlin
2009-04-15 16:29 ` [Qemu-devel] [PATCH 9/9] Introduce VLANClientState::cleanup() Mark McLoughlin
2009-04-15 17:34 ` [Qemu-devel] " Jan Kiszka
2009-04-16 1:07 ` Marcelo Tosatti
2009-04-16 3:24 ` M. Warner Losh
2009-04-16 14:49 ` Mark McLoughlin
2009-04-16 14:52 ` [Qemu-devel] [PATCH 09/09 v2] " Mark McLoughlin
2009-04-16 14:53 ` [Qemu-devel] [PATCH 10/09] Free VLANClientState using qemu_free() Mark McLoughlin
2009-04-16 20:44 ` [Qemu-devel] Re: [PATCH 9/9] Introduce VLANClientState::cleanup() Marcelo Tosatti
2009-04-28 12:08 ` Paul Brook
2009-04-28 16:46 ` Anthony Liguori
2009-04-28 17:17 ` Paul Brook
2009-04-28 17:25 ` Anthony Liguori
2009-04-28 17:46 ` Paul Brook
2009-04-28 17:49 ` Anthony Liguori
2009-04-28 18:28 ` Paul Brook
2009-04-28 21:38 ` Anthony Liguori
2009-04-29 10:37 ` Paul Brook [this message]
2009-04-30 13:45 ` Avi Kivity
2009-04-30 16:02 ` Paul Brook
2009-04-30 16:20 ` Avi Kivity
2009-04-30 16:31 ` Paul Brook
2009-04-30 16:32 ` Avi Kivity
2009-04-30 16:37 ` Anthony Liguori
2009-04-30 16:41 ` Anthony Liguori
2009-04-30 16:58 ` Paul Brook
2009-04-30 17:51 ` Avi Kivity
2009-04-30 16:33 ` Anthony Liguori
2009-04-30 16:32 ` Anthony Liguori
2009-04-30 16:57 ` Blue Swirl
2009-04-30 17:11 ` Anthony Liguori
2009-04-30 17:45 ` Jan Kiszka
2009-04-30 17:48 ` Avi Kivity
2009-04-30 18:17 ` Jan Kiszka
2009-04-30 18:19 ` Avi Kivity
2009-04-30 18:22 ` Anthony Liguori
2009-04-30 17:59 ` Anthony Liguori
2009-04-30 18:10 ` Blue Swirl
2009-04-30 18:20 ` Jan Kiszka
2009-04-30 18:32 ` Anthony Liguori
2009-04-30 18:57 ` Blue Swirl
2009-04-30 18:16 ` Jan Kiszka
2009-04-29 7:36 ` Markus Armbruster
2009-04-16 14:49 ` Mark McLoughlin
2009-04-15 17:13 ` [Qemu-devel] Re: [PATCH 5/9] Remove some useless malloc() checking Jan Kiszka
2009-04-15 16:55 ` [Qemu-devel] [PATCH 2/9] struct iovec is now universally available Christoph Hellwig
2009-04-15 17:25 ` Mark McLoughlin
2009-04-15 17:27 ` Christoph Hellwig
2009-04-15 21:18 ` François Revol
2009-04-15 21:52 ` M. Warner Losh
2009-04-15 17:44 ` M. Warner Losh
2009-04-17 18:06 ` [Qemu-devel] [PATCH 1/9] Remove stray GSO code from virtio_net Anthony Liguori
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