New Mac Pro: Jumbo Frames available?

Hi,
i intend to buy a new mac pro - but beeing forced to use jumbo-frames in my network.
Is this network-packet-frame-size (9000) working on new mac pro´s ?
Thank you in advance for any information about it.
BR
Peter

It does not say "about 9000" -- Your frames are too big.
     -- Im not following you on this one. 9000 should be achievable, as many people can attest.
Are you enabling full duplex and flow control as well?
     -- Yes, as I said, "tried everything."
What happens when you try to manually configure 8160 or whatever packet size?
     -- Does not work. I said this in the post.
How do you confirm that you have indeed connected at Gigabit Speed, and at what packet size?
     -- ifconfig
The way I determined my negotiated packet size is a combination of ifconfig commands and logging and ping testing and logging using parameters to "back in" to the exact packet size thats being transmitted.  This was done from the switch shell and the workstation shell.
The point of my post is that the Apple onboard NIC driver in ML is buggy. Mav's driver seems to have cleaned up a little, but still doesn't work in my scenario the way it should.  When I say my scenario, I mean my exact scenario: M7100 switch, 5,1 MacPro 10.8.5, etc.
As stated in my post, the installation of a well written driver solved the problem, which proves Apples onboard driver has bugs as many people have known for years. You could always try to debug the driver if you wear big boy pants, but I'm wearing Scooby Doo.
We have a bunch of shiny black cylinder MacPro's coming in soon. Will be interesting to see if jumbo frames work as advertised. I feel like jumbo's been a little off since 10.6.8

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