[Bug 215737] [bhyve] utilizing virtio-net truncates jumbo frames at 4084 bytes length

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215737

--- Comment #20 from Vincenzo Maffione <vmaffione at FreeBSD.org> ---
I prepared a patch to enable mergeable rx buffers for virtio-net, even with the
tap backend.

https://reviews.freebsd.org/D23342

Anyone willing to test this with jumbo frames?
To test it, append "mrgrxbuf=on" to your virtio-net command-line, e.g.
  -s 2:1,virtio-net,tap1,mrgrxbuf=on

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