> > Right now my box is doing ~28,000pps per direction per interface (out > > public, in public, out internal, in internal), totalling around > > 112kpps. It doesn't seem to want to go any higher than that. I've just > > tried moving the internal connection off of the dualport PCI-X card > > and onto the internal nic, and it hasn't made a difference. I'd be a > > little confused if two syskonnect cards would have double the > > performance of what I have in the machine right now... > > at these packet rates I am not surprised by sk(4) performing more than > twice as good as others.
I've got a different P4-based SuperMicro motherboard that I've been troubleshooting, too. It's not seeing the weird PCI interrupt routing error message that dormando described, I'm just getting heavy PF congestion with moderate 12Mb/s & 12k pps traffic rates. In benchmarking with an sk card replacing one of the onboard em's, I saw a definite improvement, but still encountered congestion around 15~20Mb/s. Not to generalize, but in my case, evidence points to this SuperMicro motherboard being pretty craptastic. Incidentally, for the boxes based on this motherboard that I have in production, I used the Henning's recommended value for net.inet.ip.ifq.maxlen, and saw a significant reduction in my congestion counter rate. 15~30/s versus 100's. cheers, --Matt
