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

Hello!

Well my experience is that it very hard not to say almost impossible to 
extrapolate idle cpu into any network system capacity. I guess this is 
what you are trying to do? 

Rather load and overload the system with traffic having the characteristics
you expect as a bonus you will get some kind proof of robustness and 
responsiveness a max load. There are tools for this type of tests.


Pádraig! Very funny... I started hacking 2 hours ago on idea I 
had for long time, This to do a light version of skb recycling based
skb->users (the pktgen trick) with very minimal kernel change..

Anyway attached is a small patch that I used to make the e1000
"own" the packet buffers, and hence it does not alloc/free
per packet at all. Now this has only been tested in one
configuration where I was just sniffing the packets, so
definitely YMMV.

						--ro