> On Sat, 13 Mar 1999, Pavel Machek wrote:
>
> >What about kernel telling tcpdump [lost 5 frames here]? It is better
> >than silently loosing your frames. It will not go OOM. What do you
> >think?
>
> I thought about that infact. The only thing I can accpet here is to printk
> a warning every time a sock packet is losing a frame. So doing the check
> by hand and if it's ok recalling force_ and if it's not ok rejecting the
> packet kprinting something.
No. You add a counter to /proc/net/netstat. For faster accessing (reading
/proc is slow) you could also add a special getsockopt to af packet, or if
you want to get fancy a new ancillary message type that passes socket
statistics. Note that only intrumenting af_packet is not enough, you have
to cover all the OOM cases in net/core/dev.c as well.
-Andi
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