[nsp] Cat 6500 jumbo frame support anomolies

[Keoseyan, Scott]

Hello, 

I have enabled jumbo frame support on a 6500 (CatOS 7.2.2 with WS-X6316-GE-TX) and then on a couple Netfinity X-series servers w/1000Base-T NICs and I am seeing some strangeness.

Performance seems sluggish between these two devices and the two interfaces on the switch are recording giants.  I checked the IBM docs for the NIC and they state either that the frame-size is 9000 bytes or 9KB (9216 bytes) (they were unclear) which should be fine as the jumbo-frame size on the switch is 9216 bytes.  I don't have the server NICs configured for anything special other than I have the secondary NIC configured as a stand-by port connected to another switch, and I am wondering why I would still be seeing giants and why the performance is off.

Would anyone have any ideas?  I have disabled jumbo-frame support on the switches and the servers for the time being but I am concerned that having it turned on would be a problem.

-sak