I am having problems with the network performance between SLES and AIX. I have tested the network performance from
- AIX 1 Gbit/s to AIX 1 Gbit/s
- SLES 11 10 Gbit/s to SLES 11 10 Gbit/s
- AIX 1 Gbit/s to SLES 11 10 Gbit/s and reverse
there are also other machines on the network, so we don't have the full bandwidth, but the network is definitely not flooded by the other machines.
- niping (network performance measurement tool from SAP)
between two AIX machines I am getting "decent" results of about 110 Mbit/s between the two Linux machines I am getting good results of about 2,2 Gbit/s but between Linux and AIX, independent in which direction, I am getting only about 30 Mbit/s, consistently over all the 3 measurement tools. All tested adapters are in the same subnet!
Routing is not the problem. When I am doing traceroute, the nodes are connecting directly to each other without taking a hop over a gateway. There are also no Ierrs/Oerrs according to netstat -i on any machine. Network stability test over ~20 minutes via ping is decent as well.
So personally I would say I can exclude the possibility of a networking problem and can narrow it down to the speed negotiation or buffer size negotiation between AIX and Linux. For your info: All hosts are Logical Partitions (Virtual machines so to speak) on IBM PowerVM. Somebody got an idea what to do?