High Performance TCP/IP communications with HPs and IBMs connected around an Ancor Fibre Channel Fabric

VIII. Appendix: How to configure the network parameters under Aix O.S. to run High Performance TCP/IP.

RS/6000 IBM workstations, running Aix version 3.2 Operating System, are implementing High Performance TCP/IP. The command "no -a" returns informations on the configuration network on a node. If the RFC 1323 flag is set to 0, that means High Performance TCP/IP is disabled. To enable it, just turn the "rfc1323" flag on to 1 by using the following command (as a super user): "no -o rfc1323=1".

To have a fully efficient network configuration, some other parameters need to be modified. The following list provides one configuration example that is currently working on our workstations:

"no -o sb_max=6000000"

"no -o rfc1323=1"

"no -o thewall=6000"

"no -o lowclust=200"

"no -o mb_cl_hiwat=2000"

"no -o tcp_sendspace=655360"

"no -o tcp_recvspace=655360"

"no -o udp_sendspace=655360"

"no -o udp_recvspace=655360"

There is no need to recompile the kernel nor to reboot the machine.

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