Although usually harmless, I think the messages could/should be documented in the xl manpage
Give network adapter using the xl(4) driver some workload
There might be some other underlying technical snags with this one (I guess if these messages appear constantly and tx treshold goes over some value the adapter is broken...), but I'd suggest the following:
Add another entry under diagnostics (maybe as the last one):
xl%d: transmission error: 90
xl%d: tx underrun, increasing tx start threshold to xxx bytes
This message may appear while the adapter tunes it's transmission buffers under load. If these messages won't appear constantly but only soon after reboot, or during heavy network load spikes, they can be probably ignored.
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