h_ertt cc_vegas loader.conf interaction on stable/8

Jason Hellenthal jhell at DataIX.net
Tue Sep 20 04:52:58 UTC 2011


On stable/8 as of the date of this message when attempting the following
configuration the sysctl MIB net.inet.tcp.cc.algorithm is not available
for /etc/sysctl.conf to tune for whatever reason.

/boot/loader.conf:
h_ertt_load="YES"
cc_vegas_load="YES"

/etc/sysctl.conf:
net.inet.tcp.cc.algorithm=vegas


After boot the system still has the congestion algo set to 'newreno'

To get around this I had to load the above two modules at rc.local stage
of the boot and also tune the sysctl via this method.


Has anyone else seen this behavior with other congestion algo's ?

Can any developer advise what is controlling this ?


Thanks in advance.
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