Re: _High_ CPU usage while routing (mostly) small UDP packets

Karsten Desler writes:

* David S. Miller wrote:

quoted

It's spending nearly half of it's time in iptables.
Try to consolidate your rules if possible.  This is the
part of netfilter that really doesn't scale well at all.

Removing the iptables rules helps reducing the load a little, but the
majority of time is still spent somewhere else.

I had a similar scenario recently with a very low spec box and found it to 
be the QoS. Disabling traffic shaping and removing the QoS modules made it 
much faster. I don't know if you're using them but it's worth pointing out.

Cheers,
Con