Hi Wijnand, Having fun @ HAR? :)
On Thu, Aug 13, 2009 at 11:19:27AM +0200, Wijnand Wiersma wrote: > Hi, > > I am using a machine with only a 500Mhz VIA cpu as NAT/IPSEC gateway > here at the har2009.org camp. > Sometimes the internet is hardly usable, loadavg spikes up to 14. When > investigating I see 80-90% of the CPU time is because of interupts. > Almost all interrupts are for the rl0 and rl1 interface. > > The interrupt load is not coupled to bandwith usage, we can use 60Mbit > without any problems. > I know rl(4) cards are crappy but I am wondering what could cause these > strange spikes? > It must be because of packets per second, but I can't find a offender. > Are there any tweaks to mitigate the effects? > > Right after the load spikes (normally these last for 15 minutes) the > IPSEC tunnels are not in a usable state anymore. > Does anyone have a workaround for this? You could try using polling(4) for the rl cards. This could ease interrupts a bit. Kind regards Robert Blacquiere
