You are right that any value should be OK, and I agree that this is a weird lapse on the
part of the nvidia driver, but I would point out (having had similar trouble myself) that this
is at least documented in the release notes, under "Module Parameters"
Quote:
MTU
The "mtu" module parameter controls the MTU size in bytes. This parameter takes a value between 1500 and 9202, inclusive. By default, a 1500 byte MTU is used. This parameter is only relevant when hardware offload mode is turned on.
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