[openbeos] Re: Networking : R5 or BONE
- From: "Nathan Whitehorn" <nathan.whitehorn@xxxxxxxxxxx>
- To: openbeos@xxxxxxxxxxxxx
- Date: Sat, 26 Jan 2002 18:21:40 EST (-0500)
>
> > Really? It says in the FAQs that they are staying in user land.
> > Besides, much of the overhead with net_server is not context switch
> > overhead. app_server has the same kind of ops and low latency. What
> > killed net_server's performance was the truly enormous number of
> > copies
> > (I think it was in the double digits) that it made of *every* piece
> > of
> > data that went through it. BONE was a one copy (memory->net card)
> > stack, and was made as close to zero-copy as humanly possible,
> > which
> > is
> > responsible for much of its performance.
>
> Yes, the FAQ is outdated; it was originally planned to implement a
> user
> -land stack.
>
> And although the number of copies is huge for the net_server, this
> could be fixed with a better implementation. And if the Net API would
> do it right, real zero-copy would be possible, which is not with the
> BSD API.
>
> But the context switch overhead and the fact, that Travis is already
> working on a networking stack in kernel-space lead to the conclusion
> that it makes more sense to follow that route.
Now, Axel, say if Zoidberg does a userland net stack... as we were
already planning to do. I think we could do this properly, don't you?
:P
-Nathan
--
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Cheat.
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