E Kogler wrote:
> My option would be to force the gigabitport to 100MBit :-)
> Edgar-------------------------------------------------------------------------

The TCP/IP protocol has flow control "built in." If the sender is sending
too fast, the receiver will tell it to slow down. There really is no need
to use hardware flow control.

 Hardware flow control causes issues when used with LTSP. If the pause
frame is sent to the server, everyone freezes. If the pause frame is sent
to the port on the switch the client is connected to, the switch buffer
can fill up - causing a pause frame to be sent to the serve.

  1)Reducing the server's port to 100MBit doesn't make sense. Instead of
being able to service 10 clients(ish) at full speed, it can service only
one.

  2) Generally disabling *hardware* flow control works best. be sure to
disable it *everywhere* - client's NIC, server's NIC, switch.

  3) I have on occasion run into packet size problems where the GBit MTU
was slightly too big for the 100MBit NIC and that caused lots of
retransmits.


Pete Billson
-- 
ELB Internet Service, Inc.
http://www.elbnet.com
(908) 317-8606



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