[linux-dvb] Re: V4 API proposal

["Franck Arnaud" <franck@nenie.org>]

Johannes Stezenbach:

> What I meant to say is that we would probably want to have
> support for copying data within the kernel/driver, without
> having to copy data to userspace from one driver and back into
> the kernel to the other driver. E.g. VDR currently does a lot
> of copying in "transfer mode", and it works fine, but it's not
> particularly efficient.

I know little of Linux internals but cannot that be done 
at ~ zero cost in user space? For instance I'd think you 
could implement a read() as a simple MMU remapping rather 
than a real copy and same for write(), maybe with a bit of 
care about page alignment. How does the "zero copy 
networking" stuff works?

--
franck@nenie.org



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