As of 4.9.13-4, support for the BBR TCP congestion control algorithm has not been compiled into the kernel:
$this->bbcode_second_pass_code('', '% sysctl net.ipv4.tcp_available_congestion_control
net.ipv4.tcp_available_congestion_control = cubic reno')
Support for BBR can be enabled with "CONFIG_TCP_CONG_BBR=y". It has already been added to the vanilla Arch Linux kernel, so it'd be (really) nice to see it in ALARM too.
About BBR:
http://queue.acm.org/detail.cfm?id=3022184
https://lwn.net/Articles/701177/
(Also not sure if this is the right forum for requests, but as it's related to the kernel...)