[Soekris] high CPU usage for network interrupts on 4801

[Jan Hoevers]

Poul-Henning Kamp wrote on 16-9-2007 23:26:
>>> I'm using a Soekris net4801-60 as a router, with a lan1641 in the PCI 
>>> slot, giving me 7 ethernet ports. I'm running pfSense 1.0.1, a routing 
>>> package based on FreeBSD 6.1 and PF.
> The 4801 unfortunately has all three internal network cards on the
> same interrupt line, that's not a good thing because for every interrupt
> the kernel will have to check all three network interfaces to see
> where it came from.

Didn't know that, good you mention it.
When booting the 4801 I see they're on int 10. The lan1641 pci card has 
its four interfaces on int 5 and 11.

I have my ntp server on the 1641 and the upstream connection on the 4801 
board, so they're not sharing interrupts. Seems like I've optimised that 
without knowing what I was doing.   :-)

I had everyting on the 4801 for a while (same interrupt), but I saw 
little or no difference.

Jan