Not likely. On a big SGI yes, otherwise no
> But I doubt it will be ever possible with PC hardware. (Hmm, but then,
> with a memory mapped network card and a busmaster.. why not?).
You need a board that can copy on checksum as its used as a DMA target.
I've yet to see one.
> I can not follow you here. The only point is that copy_file() is simpler
> to implement and optimize as the much more flexible mmap() is. I think
It isnt. Its hellish to implement. In fact you'd implement it in the kernel
by faking calls to sys_mmap anyway ..
Alan