Re: is CONFIG_PACKET_MMAP always a win?
Jamie Lokier (email@example.com)
Fri, 22 Feb 2002 19:04:31 +0000
Alan Cox wrote:
> > > Overhead: kernel does a full memcpy of the packet body to get it
> > > into the ring buffer, and my program does another to get it out.
> > I had a look at this about a year ago, and it seems there is no method
> > provided to read the packets without copying them, if you need them in
> > user space.
> You can process them in the ring buffer. If you can't keep up then you
> are screwed any way you look at it 8)
That still doesn't avoid copying: af_packet copies the whole packet (if
you want the whole packet) from the original skbuff to the ring buffer.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to firstname.lastname@example.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/