Dear all,

Reading through the tcp blackhole detection code (support RFC 4821) in FreeBSD 
including the recent bug fixes, I am wondering why is it still not enabled in 
default? Given the fact that this implementation was a merge from xnu, and the 
xnu has enabled it in default, do we have a plan to enable it in default? Or is 
there any concern about the side-effect from it as performance regression 
against some false positive blackhole event like a temporary link flap, which 
is long enough to trigger a lower MSS but shorter than 6 RTO?
  << enabled in macOS 10.6  << bug fixes  << merge from xnu

--Cheng Cui
NetApp Scale Out Networking

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