Hot Diggety! David Longo was rumored to have written:
> 5.1.5.2 has been out about a month or so now.
> Also that something else isn't broke?

There was a major performance bug fixed in 5.1.5.3; we had a really
nasty situation where a west coast client was sending data at only 2 Mbps
to the east coast server; raw network between the two is up to 32 Mbps
as evidenced by ttcp tests between west coast client and other east coast
servers on the same subnet.

Turns out we needed an efix for the pre-release version of fixed netinet
driver in AIX 5.1 (to be bos.net.tcp.client 5.1.0.37 and released next week)
to fix the OS perf bug *AND* to also upgrade to 5.1.5.3 from 5.1.5.2.

Doing so improved the ITSM network perf from 2 Mbps to 8 Mbps, and raw OS
network perf to 32 Mbps. Merely fixing the OS perf bug wasn't sufficient
for us. (We tested and retested between every single step to rule out
multiple variables.)

>From the 5.1.5.3 README:

PQ68076     PERFORMANCE DEGRADATION AFTER UPGRADE TO 5.1.5.0, 5.1.5.1 OR

-Dan