On Fri, 21 Sep 2012, Erwin Lubbers wrote: > I'm using OpenBSD 5.1 and an Intel 10GbE SR (82598AF) ethernet card as a > router/firewall and it's working almost perfect. It is routing around 2 gbps > of traffic. > > On the ix0 interface there are several vlans configured with an MTU of 1500. > When I'm pinging a switch connected to the system (with 10 gbps) there is no > packet loss while sending packets of 1472 bytes. From 1473 bytes and more > there is somewhere between 15 to 40% loss. > > I first thought the switch was busy, but from another (Linux) system, > connected with 10 gbps and the same network interface there is no loss on > larger packets. > > Does someone have an idea on how to solve this?
Can you show from both systems with tcpdump what the packets look like? You are using normal (no flood) ping and the systems and switch are not loaded with other traffic?
