[Bug 268490] [igb] [lagg] [vlan]: Intel i210 performance severely degraded

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268490

--- Comment #31 from Kevin Bowling <kbowling@freebsd.org> ---
(In reply to Daniel Duerr from comment #30)
The idea is to bisect in somewhat of a reverse fashion where you introduce the
one line change on during each bisection step:
-       em_if_set_promisc(ctx, if_getflags(ifp));
+       em_if_set_promisc(ctx, IFF_PROMISC);

and see if that triggers a different resultant commit hash.  Instead of walking
backwards to see where things break, which you did, and which identified this
line of code, we want to see when this line change results in bad performance
if it were applied earlier before, and during other code changes.  If I
understand correctly, applying this one line change to 12.2 did not result in
poor performance.  If you have already done this and the performance is poor on
12.2 with the change there is no need to bisect further.

The drivers are very similar between 12, 13, and 14 so if it is a driver
regression it probably affects all of these.  If it is some cross cut with the
network stack there could be something different but I am not aware of major
differences in this area.

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