Increasing effective window size on high latency path

I've been trying to get throughput up on a long-haul connection, using
Linux 2.4 (AS3.0) and having very poor performance. I have been trying
to tune the parameters,
/proc/sys/net/ipv4/tcp_adv_win_scale
/proc/sys/net/ipv4/tcp_app_win
/proc/sys/net/ipv4/tcp_window_scaling
/proc/sys/net/core/optmem_max
/proc/sys/net/core/rmem_default
/proc/sys/net/core/rmem_max
/proc/sys/net/core/wmem_default
/proc/sys/net/core/wmem_max
and have not seen any significant improvement in performance. I have
multiple OC12 at both ends, and 100Mbit from the rounter to the NIC.
Identical hardware is performing as desired in two locations with lower
latency.

Any suggestions for additional tricks, or thoughts?

--
bill davidsen
SBC/Prodigy Yorktown Heights NY data center
http://newsgroups.news.prodigy.com