[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 #12 from P Kern <des.gaufres at gmail.com> ---
(In reply to Rodney W. Grimes from comment #11)
[ doh! vmx(4)/em(4) -- not ..(8)!  sigh, brain rot. ]
yup, I was suspecting vmx(_4_) was doing something like that.
With our limited resources, our options for now are ...
   - live with vmx(4) NICs with 4K MTU
or - switch to em(4) NICs with 9k MTU.
Unless there's some other benefit to using em(4) NICs in
our ESXi VMs, we'll probably stick with using vmx NICs.

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