Gigabit Performance on Penryn MBP -- can't go beyond 230 MBit/s

I've been seeing some pretty poor gigabit throughput with my MacBook Pro 15", about 220-230 Mbit/s. Here are the things I've ruled out:
- swapped cables several times, including Cat 6 cabling fresh from the package
- Tried several switches: D-Link DGS-2208, Netgear 8 port desktop switch and an enterprise grade Cisco 48 port Gigabit switch
- Several other hosts (Ubuntu, CentOS, WinXP)
- Different test tools: netio and a web server with curl piped into /dev/null
- Made sure I'm not CPU bound. When I run the test tools locally, I get well north of 1,000 MBit/s (with the curl test, I got > 5,000)
I've ruled out just about any environmental parameters, and the throughput is pretty much pinned at 220-230 Mbit/s. Between the several target hosts, I was able to get 800-900 MBit/s.
At this point, am I looking at sucky hardware? Software issue? Driver? I'm running Leopard with all the latest updates...

Yes, you can set the MTU to 9000. But that hasn't been set on any of the other hosts and shouldn't have such a dramatic impact.

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