Cpu up, network down, after lassie reboot?

Last week for a reason I haven't figured out yet, lassie rebooted my linode.

After the reboot, the cpu load went way up, and b/w usage went down

Nothing has changed on any of the sites running on this linode,

they are all hosting pretty static stuff.

~~http://sooser.com/cpugraph.png" />

~~http://sooser.com/networkgraph.png" />

Has anybody else seen this happen?

Did I get a very busy neighbour on my server, taking up most of the cpu cycles,

so I have to use more resources/cpu time to get the same amount of work done?

I don't even know where to start looking, so any help is more than welcome.

Cheers~~~~