Re: [Xen-devel] RFC: [0/2] Remove netloop by lazy copying in netback

[Keir Fraser <keir@xxxxxxxxxxxxx>]

On 20/3/07 10:11, "Herbert Xu" <herbert@xxxxxxxxxxxxxxxxxxx> wrote:

> Yes that's a good idea and would avoid the grant table addition.
> 
> My only concern would be future acceptance into the mainstream
> Linux kernel, especially on the domU side since I'd like to see
> this idea used for dom0 => domU as well.
> 
> However, I'm certainly happy to explore doing it in the way you
> suggested.

That's quite a valid concern, but I think that the required addition to the
#PF handler (certainly for i386 and x86/64) will be clean and small, and it
will not affect #PF critical-path latencies. I'd be fairly optimistic about
it getting accepted upstream, perhaps modulo concerns over whether we'd need
to implement it for *every* architecture.

 -- Keir


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