D-Link DGE-550SX tuning.

Archived from groups: comp.dcom.lans.ethernet (More info?)

I have a Windows 98 Second Edition system and
a Windows XP Professional system connected by a pair
of D-Link DGE-550SX Gigabit fiber Ethernet adapters.

The W98SE system is on an 850 MHz system, the
WINXPP system is on a 2.4 GHz system.

Using the default parameters I get about 300 Mbits/second
with the PassMark Performance Test V5.0 Advanced Networking
test using TCP, with the slower system as the server. Using
the slower system as the client only gets to about 100 Mbits/second.
In both cases the CPU on the slower machine is the limiting
factor.

I used the out of the box parameters. Which are
802.1Q/1P VLAN tagging Disabled
Connection Type AutoSense
Flow Control Enabled
GVRP Enabled
Inter-Frame Spacing 4352 bit times
Jumbo Frame Support Disabled
Network Address
Receive Buffers 64
TCP/IP Checksum Offload Enabled
Transmit Buffers 128
Tx Threshold 256
VLAN ID 6

Can anyone suggest any changes for better performance?

If I Enable Jumbo Frame Support will things break if
one of the systems winds up being a router for the other?
I.e., will a Jumbo Frame be sent between the two machines
and then not be able to continue to a third machine via
an Ethernet adapter that doesn't support Jumbo Frames?

Is it possible that I can tune things so that the
speed doesn't increase but the CPU load decreases? Perhaps
using bigger Inter-Frame Spacing or fewer transmit buffers.

I AM NOT RESPONSIBLE FOR ANYTHING PAST THIS LINE