[Bug 246660] Sporadic LACP Lagg Flap

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246660

--- Comment #2 from nonesuch at longcount.org ---
Alex
  I have a span port setup on each switch going into a tap / agg switch that
feeds a corvil packet capture box. From the corvil I can pull the traffic by
mac and look at what was going on using wireshark going back about 3 weeks.
Second thing I did was capture the details from net.link.lagg.lacp.debug = 1. 
Looking a the two sources i can see the Freebsd side of things seams to miss a
beat, by slowing down somehow . I am not exactly sure how or why this is
happening.   

  So far I have two ideas why this is going on. In 11 something the sysctl
net.link.lagg.default_use_flowid was changed from a default of 1 to 0 . 
I suspect this can be causing the issue. Setting use flowid to 1 appears to
keep all of the arp, lacp and non ip protocols on queue 0 . This prioritizes
the traffic enough to make the kernel lcap bits respond fast enough. 

Here is the post about the lacp change. Maybe we can ping  someone from
Multiplay .
https://www.mail-archive.com/svn-src-all@freebsd.org/msg155156.html

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