Switch to BBR congestion control

src/freedombone-utils-setup

@@ -685,6 +685,13 @@ function setup_powerline {
     fi
 }
 
+function congestion_control {
+    # see /proc/sys/net/ipv4/tcp_congestion_control
+    echo 'net.core.default_qdisc=fq' > /etc/sysctl.d/10-custom-kernel-bbr.conf
+    echo 'net.ipv4.tcp_congestion_control=bbr' >> /etc/sysctl.d/10-custom-kernel-bbr.conf
+    sysctl --system
+}
+
 function setup_utils {
     read_config_param "PROJECT_REPO"
     write_config_param "PROJECT_REPO" "$PROJECT_REPO"
@@ -695,6 +702,9 @@ function setup_utils {
     function_check support_256_colours
     support_256_colours
 
+    function_check congestion_control
+    congestion_control
+
     function_check enable_predictable_device_names
     enable_predictable_device_names