Doubt regarding the e1000 JF Support

linuxunix

linuxunix

I read these lines soemwhere:
Code: 
Adapters based on the Intel(R) 82542 and 82573V/E controller do not
 support Jumbo Frames. These correspond to the following product names:
 Intel(R) PRO/1000 Gigabit Server Adapter
 Intel(R) PRO/1000 PM Network Connection

I have FreeBSD 8.1 64 bit VM running on the ESX 4. I have selected e1000 as network Adapter.
When I run the command:
Code: 
ifconfig em0 mtu 9000

The Command Works.
If e1000 doesnt support Jumbo Frames how did it took that value.
Pls Clarify.
 
em(4) supports several variations of the hardware. Some do jumbo frames, some don't. It could easily get a lot weirder in a VM, depending on how the VM emulates the card and the mode of networking used.

% pciconf -lv | grep -A3 em0
should show which of the Intel cards is being emulated. Check the man page link above to see what it says about that hardware.
 
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