shawn at cpl.net
Wed Jun 25 03:29:14 PDT 2003
> That's certainly a step in the right direction :)
> > But something is still very
> > wrong performance wise. It has helped, but I still can't push in/out
> > nearly 100Mb/sec. (100Mb in, 100Mb out I mean). A simple FTP transfer
> > locally through the routers gigabit interface causes our internet
> > performance to plummet. I've disabled all the onboard stuff that was
> > sharing IRQs with PCI cards, but I didn't figure that was an issue,
> > didn't make a difference either way. Would the fact the gigabit is on
> > same PCI bus have any bearing? I would expect to at least get 100BT
> > performance even so, but I don't have any experience with gigabit
> > ethernet...
> The only thing I can suggest is try different PCI slots, or Gigabit cards,
> or, worst case a different system. Having NIC's on separate PCI busses (as
> opposed to both on the same PCI bus) may help it [But that's probably
> to need a new board etc.]
Thats what I was going to try next, but i've noticed this :
gw# netstat -I xl0 -w 1
input (xl0) output
packets errs bytes packets errs bytes colls
7120 11 9118416 5566 0 2507132 0
6754 6 8498898 5649 0 3009719 0
7104 9 8856812 5802 0 3004529 0
7737 19 9787501 6429 0 2994557 0
7551 16 9670490 5948 0 2761794 0
I would guess such a large number of errors per second could be causing the
interrupt usuage? From what i've been able to find such input errors are
usually caused by a bad cable, or switch...
> You don't say what Gigabit nic's your using? - I've had a lot of varied
> results with different nic's, with surprisingly cheap 10/100/1000Mbit
> giving 'reasonable' performance - but get left standing for dust by other
> more expensive cards.
Its an Intel Fiber card, don't know the exact model offhand...
> The only other thing I can think of is, check the duplex/media options are
> all setup properly on the cards / switches etc. - or try forcing things to
> fdx etc.
Been there, done that, full duplex/autoselect makes no difference, but its
currently set for full/1000SX on both ends.
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