From: Stephen Hemminger <shemminger@vyatta.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
Chris Wright <chrisw@sous-sol.org>,
Rusty Russell <rusty@rustcorp.com.au>,
virtualization@lists.linux-foundation.org, "Xin,
Xiaohui" <xiaohui.xin@intel.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"hpa@zytor.com" <hpa@zytor.com>, "mingo@elte.hu" <mingo@elte.hu>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>
Subject: Re: [RFC] Virtual Machine Device Queues(VMDq) support on KVM
Date: Tue, 22 Sep 2009 09:29:57 -0700 [thread overview]
Message-ID: <20090922092957.17e68cbc@s6510> (raw)
In-Reply-To: <200909221350.54847.arnd@arndb.de>
On Tue, 22 Sep 2009 13:50:54 +0200
Arnd Bergmann <arnd@arndb.de> wrote:
> On Tuesday 22 September 2009, Michael S. Tsirkin wrote:
> > > > More importantly, when virtualizations is used with multi-queue
> > > > NIC's the virtio-net NIC is a single CPU bottleneck. The virtio-net
> > > > NIC should preserve the parallelism (lock free) using multiple
> > > > receive/transmit queues. The number of queues should equal the
> > > > number of CPUs.
> > >
> > > Yup, multiqueue virtio is on todo list ;-)
> > >
> >
> > Note we'll need multiqueue tap for that to help.
>
> My idea for that was to open multiple file descriptors to the same
> macvtap device and let the kernel figure out the right thing to
> do with that. You can do the same with raw packed sockets in case
> of vhost_net, but I wouldn't want to add more complexity to the
> tun/tap driver for this.
>
> Arnd <><
Or get tap out of the way entirely. The packets should not have
to go out to user space at all (see veth)
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next prev parent reply other threads:[~2009-09-22 16:30 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-01 6:58 Xin, Xiaohui
2009-09-01 16:05 ` Stephen Hemminger
2009-09-02 6:45 ` Xin, Xiaohui
2009-09-21 7:07 ` Rusty Russell
2009-09-21 16:21 ` Stephen Hemminger
2009-09-21 16:27 ` Chris Wright
2009-09-22 10:38 ` Michael S. Tsirkin
2009-09-22 11:50 ` Arnd Bergmann
2009-09-22 16:29 ` Stephen Hemminger [this message]
2009-09-22 18:34 ` Arnd Bergmann
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