RE: [Xen-devel] [BUNDLE] Testing a simpler inter-domain transport

["King, Steven R" <steven.r.king@xxxxxxxxx>]

> Note that like a real LAN, one badly behaved partition
> can block communication for the others they share the lan with... 

Shared page LAN is much less secure than a real LAN.  Any domain
attached to the shared page, i.e. in the LAN, can modify any frame "in
flight" on the page.  Recipients have no confidence that the received
frame is actually what the sender sent.

-steve



-----Original Message-----
From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Rusty
Russell
Sent: Wednesday, February 08, 2006 3:05 AM
To: veillard@xxxxxxxxxx
Cc: xen-devel; Tony Breeds
Subject: Re: [Xen-devel] [BUNDLE] Testing a simpler inter-domain
transport

On Wed, 2006-02-08 at 05:12 -0500, Daniel Veillard wrote:
> On Sun, Feb 05, 2006 at 02:38:51PM +1100, Rusty Russell wrote:
> >     dom0# modprobe ohlan create
> >     ohlan: created lan eth1 at address 0x1b6000
> >     domU# modprobe ohlan address=0x1b6000
> > 
> > Feedback welcome!
> 
>   point to point performances looks good, but I'm starting to worry 
> about thing like group communication in a large Xen machine, assuming 
> you can run a few dozens domains consurrently, it may be useful to get

> some efficient muticast based communication mechanism, the shared 
> pages should help in some ways (usuall memory/speed tradeoff though).
Did you look at this ?

Yes, you can add other domains to the same lan:

        domU2# modprobe ohlan address=0x1b6000

Currently limited to 32 partitions for no particularly good reason.
Note that like a real LAN, one badly behaved partition can block
communication for the others they share the lan with...

Sorry for the confusion!
Rusty.
--
 ccontrol: http://ozlabs.org/~rusty/ccontrol


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