Is bbr activation needed?

Q&A
1

is BBR enabled by default? In ubuntu, it has to be enabled manually.

2

It looks like it is enabled by default.

$ grep -E "BBR|RENO" /usr/lib/kernel/config-5.0.17-760.native 
CONFIG_TCP_CONG_BBR=y
CONFIG_DEFAULT_BBR=y
# CONFIG_DEFAULT_RENO is not set

and

$ sysctl net.ipv4.tcp_available_congestion_control
net.ipv4.tcp_available_congestion_control = reno bbr
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