Re: [Xen-devel] jumbo frames

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 11 May 2005, at 07:27, Kip Macy wrote:

> > > What is the status of jumbo frame support in dom0 and domU? Unless
> > > something has changed I know it isn't supported in domU, but 
> > > shouldn't
> > > it just work in dom0?
> > I think it'll just work, but it's untested. If the jumbo area spans
> > multiple memory pages then it needs to be allocated with something 
> > like
> > dma_alloc_coherent, or be represented by a fragmented skbuff. (i.e.,
> > hopefully the network stack and drivers don't assume that kmalloc()
> > always return physically contiguous memory extents).
> What all would need to change to support it for domUs?
We need scatter-gather support on the device channel, and the frontend 
and backend both need to know how to queue and dequeue fragmented 
network buffers.
 -- Keir


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