[OpenAFS] Heavy performance loss on gigabit ethernet

[Systems Administration]

> Ok. How about MTU? How many segments are involved, and what is the MTU 
> on each?

     ----------------- gigabit fiber switch ----------------
      |                                                                  
|
server                                            --------- 100M copper 
switch -------------
                                                            |
                                                        client

Client and server are both configured to operate at 100Mbs full-duplex  
- both client and server have MTU set to 1500

Server is hosted with NetGear GA620 gigabit fiber card w/ acenic kernel 
driver  - configured for 100Mb fdx
Client is Apple Powermac G4 built-in gigabit copper 10bT with apple 
driver OS X 10.3.4 - negotiates to 100Mbs fdx

Have tried manual and automatic configurations for both ends, have 
tried forcing both ends to half-duplex, no change in behavior.  
Switches are configured for correct speed and duplex setting.