SUMMARY: Can't set MTU higher than 1500 on Sun GigE cards

From: Gilbreath, Jeff <jeff.gilbreath_at_mirant.com>
Date: Thu May 16 2002 - 16:47:40 EDT
Thanks to all the people who responded.

Quick Overview:
Private switched but non-routed network with Cisco Catalyst switch and all GigE blades in switch.
Various Sun servers with GigE cards connected to private network.
GigE to GigE, so fragmentation is not a issue.
Testing done through switch as well as direct server to server.

Symptom:
I can't turn the MTU size up on the GigE interface to increase throughput.

Answer:
Official answer finally recieved from Sun is the Sun GigE cards no longer support Jumbo packets.
And can not be set to a MTU higher than 1500 (same as 10BaseT/100BaseT).

Result:
Sun GigE cards max out at about 440Mbits transfer rate even running multiple treaded iperf and ttcp tests.

My response:
Thanks to the people who suggested using SysKonnect and Intraserver cards as a alternative
to the Sun cards. They seem to be higher performance and cheaper too.

Note: The Tolly report thats listed on Sun's web page must be using the previous version.
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Received on Thu May 16 16:52:23 2002

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