Re: mmap/munmap bug

[Arjan van de Ven]

On Tue, 2005-03-22 at 09:56 +0200, Gleb Natapov wrote:
> On Mon, Mar 21, 2005 at 07:34:02PM +0100, Arjan van de Ven wrote:
> > On Mon, 2005-03-21 at 17:32 +0200, Hayim Shaul wrote:
> > > Hi all,
> > > 
> > > I have an unexplained bug with mmap/munmap on 2.6.X.
> > > 
> > > I'm writing a kernel module that gives super-fast access to the network.
> > > It does so by doing mmap thus avoiding the memcpy to/from user.
> > 
> > well... you are aware the network stack already supports generic zero
> > copy networking, right ?
> > 
> Does it support zero copy not only for send but also for receive? Can we
> receive packets directly to userspace buffers?

that it can't currently, but without some major protocol stack rework
that's not going to be easy. If you want to help do that work,
excellent! Be sure to contact the people on net-dev mailinglist since
they are the ones having looked at this previously.



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