[Bug 210901] em0 stores packets somewhere and lets them out slowly under load.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210901

--- Comment #9 from dgilbert at eicat.ca ---
to be clear, this didn't seem to be interrupt related at all.  it was a
resource starvation caused by memory fragmentation and the bone-headed way we
handle 9k jumbo frames.  The whole problem would boil down to having a scarce
few 9k jumbo frame buffers servicing all the packets coming in (and the few
large ones going out).

The system now has an mlxen driver card in it.  Even more reason to prefer
jumbo frames with 10GE, but, again... I haven't even bothered as it appeared
that the jumbo frames were the issue, not the interrupts.

So... it's very possible that this ticket should be closed --- but only if
another regarding jumbo frames > 4k is opened.

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