[Soekris] net4501 reset under high packet load

Chuck Yerkes chuck+soekris at 2003.snew.com
Wed Jul 23 21:10:30 UTC 2003

Round networks always make me nervous and are inherently
broken, even if they happen to work.

Quoting PC Drew (pc at superiorcomm.net):
> I'm in the middle of doing some load testing using OpenBSD 3.3 (stable) 
> and a net4501 with a vpn1211 card and under high packet load, the board 
> just resets.  i don't see a kernel panic or anything, so I'm guessing 
> it's a hardware issue (gotta start somewhere, right?).
> The setup is that I have another OpenBSD box (we'll call it "server") 
> connected to both sis1 and sis2 on the 4501 with crossover cables.  I 
> have ipforwarding enabled on the 4501 and everything, so that's working 
> great.  I do not have any firewall or VPN configured, this is strictly 
> trying to test out the throughput of the 4501 from a simple routing 
> perspective. I'm using libnet to generate packets that go into sis1 and 
> out sis2.  I'm using the following packet sizes: 64B, 128B, 256B, 512B, 
> 768B, 1024B, 1280B, and 1518B under the following rates (in packets per 
> second): 100, 500, 1000, 2000, 3000, 5000, 10000, and 15000.
> When I send packets (of any size) at the higher rates (i.e. 10000 and 
> 15000 packets/sec), I get between 50% - 70% packet loss, which is what 
> I'd expect.  However, after a few minutes at this rate, the 4501 just 
> unexpectedly reboots.  Is this expected under high load?  Where might I 
> look to get more information about what is going on?
> BTW, for those who are interested, I'll be publishing the results of 
> this test as well as a better description when I've completed it.

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