Hi,
I had the same problem n some Dell R720. The problem exists only with the 10GBase ethernet-interfaces. With GBIC-interfaces and some transceiver the wheezy kernel works.
But you can use the kernel from wheezy backports, whichdoes not have this problem with this hardware.
regards,
Ulli
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Ulrich Hochholdinger
Mail: ulli@hochholdinger.net