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

To: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] RFC: [0/2] Remove netloop by lazy copying in netback
From: Keir Fraser <keir@xxxxxxxxxxxxx>
Date: Tue, 20 Mar 2007 10:18:54 +0000
Cc: Xen Development Mailing List <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir@xxxxxxxxxxxxx>
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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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