https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228335

--- Comment #3 from Bryan Venteicher <bry...@freebsd.org> ---
While the malloc(9) behavior may not be documented, VirtIO is not alone in
depending on the behavior. In fact, bus_dmamem_alloc(9) uses malloc(9) for <=
PAGE_SIZE allocations (given suitable alignment and attributes) so you may
still be susceptible to this depending on what kernel interfaces have been
reimplemented. Also, note there is a strong assumpting in the network stack and
drivers that mbuf clusters (including jumbo) are physically contiguous.

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