[lkml]   [2002]   [Feb]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: is CONFIG_PACKET_MMAP always a win?
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.

-- Jamie
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:24    [W:0.079 / U:0.240 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site