Re: [Xen-users] limit on the number of NICs per domU

[Goetz Bock <bock@xxxxxxxxxxx>]

On Wed, Jun 28 '06 at 14:29, Jan Srzednicki wrote:
> Xen FAQ states that there's a limitation of 3 virtual network interfaces
> per domU:
> ...
> My question is: is there any way (like setting some #define or something
> in the sources) to rise this limit to 4 or 5? Why is the limit set to 3
> actually?
Not that I would know of.

The problem is: the struct required for a virtual NIC is so big that
only three instances fit into one page of memory. And extending the Xen
interface to support more then one page of memory seams to require major
surgery.

In 3.0.0 days there were some attempts to write a patch, but that never
worked out. IIRC it's still on the ToDo list to allow more than 3
virtual nics, but there seams to be no presure.
-- 
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