Interrupt storm on net4801

Tim Vaughan <[email protected]>
Newsgroups gmane.comp.hardware.soekris.technical
Message-ID <CADzOqbSh9qdi_DDgDfhOmtgkaEqfA=7DXyfvdU_zveLVYDOu3w@mail.gmail.com>
Dear all,

I'm testing a net4801 that I bought off Ebay, running m0n0wall 1.8.1 and
BIOS 1.28. I have it on my internal network, and am downloading large files
from another server on the WAN side.

Firstly, testing with iperf across VLANs seems to max out at about 16Mbps.
That seems low for a Net4801 - am I right?
Secondly, during testing, the GUI is completely unresponsive. After
testing, I find log entries like "kernel: interrupt storm detected on
"irq10:"; throttling interrupt source".
Thirdly, if I ping the LAN interface, ping times go from under 1ms to over
30ms.

Are all these expected consequences of putting the net4801 under heavy
load, or does it look like there's a hardware fault somewhere? I have a
fairly complex setup, with multiple VLANs and about 50 firewall rules in
total.

Cheers,

Tim

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