[openbeos] Re: Networking : R5 or BONE
- From: "Axel Dörfler" <axeld@xxxxxxxxxxxxxxxx>
- To: openbeos@xxxxxxxxxxxxx
- Date: Sat, 26 Jan 2002 18:19:04 CET (+0100)
> 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Yes, the FAQ is outdated; it was originally planned to implement a user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.
Adios...
Axel.
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