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

[bugzilla-noreply at freebsd.org]

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

--- Comment #8 from Kevin Bowling <kbowling at freebsd.org> ---
(In reply to Chris Hutchinson from comment #7)
There is an MSI errata on this particular chip, see issue 63
https://raw.githubusercontent.com/tpn/pdfs/master/Intel%20Ethernet%20Controller%2082571EB%2C%2082572EI%2C%2082571GB%2C%2082571GI%20-%20Specification%20Update%20-%20Rev%206.8%20Nov%202014.pdf

I could hack something together for you right now to force a legacy interrupt
if you want to investigate that.  But first we need to see if the problem still
exists, moving our effort to 12 or 13 to be useful.

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