freebsd stable - Aug 2015 - Possible Error in the FreeBSD 10.2 Release Notes/Man page for TCP

I was reading through the Release notes, and decided to enable 
net.inet.tcp.pmtud_blackhole_detection in my test environment. It 
appears that the monitoring tunable 
net.inet.tcp.pmtud_blackhole_min_activated is incorrectly listed. Using 
sysctl -a | grep net.inet.tcp.pmtud, doesn't show it as a result. The 
test system is running RC3 built on the 7th from revision 286391 of the 
https://svn.freebsd.org/base/releng/10.2 tree.

root at freebsd:/usr/src # sysctl -a | grep net.inet.tcp.pmtud
net.inet.tcp.pmtud_blackhole_mss: 1200
net.inet.tcp.pmtud_blackhole_failed: 0
net.inet.tcp.pmtud_blackhole_activated_min_mss: 0
net.inet.tcp.pmtud_blackhole_activated: 0
net.inet.tcp.pmtud_blackhole_detection: 1

I did confirm that the pmtud_blackhole_min_activated option is also 
listed in the tcp(4) man page page as well.

If anyone is more familiar with this than I am can they look into seeing 
if there is indeed an error, or if I am missing something here.

-- 
Thanks,
    Dean E. Weimer
    http://www.dweimer.net/

On Wed, Aug 12, 2015 at 01:09:31PM -0500, dweimer wrote:
> I was reading through the Release notes, and decided to enable
> net.inet.tcp.pmtud_blackhole_detection in my test environment. It appears
> that the monitoring tunable net.inet.tcp.pmtud_blackhole_min_activated is
> incorrectly listed. Using sysctl -a | grep net.inet.tcp.pmtud, doesn't
show
> it as a result. The test system is running RC3 built on the 7th from
> revision 286391 of the https://svn.freebsd.org/base/releng/10.2 tree.
> 
> root at freebsd:/usr/src # sysctl -a | grep net.inet.tcp.pmtud
> net.inet.tcp.pmtud_blackhole_mss: 1200
> net.inet.tcp.pmtud_blackhole_failed: 0
> net.inet.tcp.pmtud_blackhole_activated_min_mss: 0
> net.inet.tcp.pmtud_blackhole_activated: 0
> net.inet.tcp.pmtud_blackhole_detection: 1
> 
> I did confirm that the pmtud_blackhole_min_activated option is also listed
> in the tcp(4) man page page as well.
> 
> If anyone is more familiar with this than I am can they look into seeing if
> there is indeed an error, or if I am missing something here.
> 
This appears to be an error based on the content of the commit log.
I will confirm with the person that committed the code, and will note
the findings in the 10.2-RELEASE errata document.

Glen

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