[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-users] Wireless device in Xen Guest

  • To: James Harper <james.harper@xxxxxxxxxxxxxxxx>
  • From: "Jui-Ting (Jerry) Weng" <jtweng@xxxxxxxxx>
  • Date: Mon, 24 Jan 2011 19:13:57 -0800
  • Cc: xen-users@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Mon, 24 Jan 2011 19:15:12 -0800
  • Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=Nl4Qcx6jeUH7avjpOu6txNH8TBFPcNUOhOhp86VeiAGryfhmSczRYodYntsO3L3Uru 8qbyWR+Lv4v6tJ25jomvGq7m/HIl9XDZtMVv3tDbVeNHn8NKezrsOM2WvJV8DEG3HD86 0HXWcfD3oELi9c3nn/FR5CUiZg+eqamIYnh58=
  • List-id: Xen user discussion <xen-users.lists.xensource.com>

I'll double check the NAT configurations.

Right now I can use wireless in DomU. it is just incredibly slow.

I perform the following test through Iperf.

laptop A. Setup an Iperf server at Dom0

laptop B. Setup an Iperf client at Dom0, connect to laptop A. Throughput is 2.2Mbps
laptop B. Setup an Iperf client at DomU, connect to laptop A. Throughput is 90Kbps

DomU throughput degrade to 1/20 of the Dom0. Since this only happen on wireless card, I was wondering if my configuration is wrong.


On Mon, Jan 24, 2011 at 5:33 PM, James Harper <james.harper@xxxxxxxxxxxxxxxx> wrote:
> Hello all:
> I'm running Xen with Gentoo. I setup two network device in Xen guest
> One of them connect to the Dom0 ethernet card via bridge, and the
> connect to Dom0 wireless card via another bridge. The interface in
> connected to the outside ethernet device have throughput close to
> (927Mbps / 917Mbps) However, the wireless interface have very poor
> (2.2Mbps / 90 Kbps). Is there a reason why wireless transmission is
> inefficient ?

How does it compare to the throughput when you are not running xen?

Wireless is a half duplex medium, and if you are talking to another
wireless device 'through' an access point it gets even worse as your
packet has to be received by the AP, then transmitted to the target,
then the response goes back the same way, so it's not nearly as fast as
the sticker on the box says.

Are you doing all the right things with the wireless interface? You
normally need to NAT the MAC addresses for it to work.


Xen-users mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.