Re: sendfile

[Pål Halvorsen]

> Sat, May 03, 2003 at 12:42:59AM +0000, Miquel van Smoorenburg wrote:
> > In article <[e-mail]>,
> > Mark Mielke  <[e-mail]> wrote:
> > >One question it raises in my mind, is whether there would be value in
> > >improving write()/send() such that they detect that the userspace
> > >pointer refers entirely to mmap()'d file pages, and therefore no copy
> > >of data from userspace -> kernelspace should be performed.
> > You mean like
> >
>  http://hypermail.idiosynkrasia.net/linux-kernel/archived/2003/week00/0056.html
>
> Yes, definately, and thank you for referring us to work that has already
> been done.
>
> mark

Does this mean that if you memory map a file and send it through TCP,
you'll have no copy operations transfering data from disk to NIC (except
the DMS transfers disk->memory and memory->NIC)?

Does there exist work implementing this also for UDP?

-ph