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Check kernel version

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- Only enable TCP BBR congestion control if the server's Linux kernel
  version is 4.20 or newer.
- BBR requires the "fq" qdisc for older kernels < 4.20. That setting
  may not take effect on existing network interfaces without a reboot.
- References:
  https://github.com/google/bbr/blob/master/Documentation/bbr-quick-start.md
  0bb9d90
This commit is contained in:
hwdsl2 2022-09-08 00:29:18 -05:00
parent 6a525c6c10
commit db54638f5e
2 changed files with 4 additions and 2 deletions
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3
vpnsetup_centos.sh
View File

@ -549,7 +549,8 @@ net.core.rmem_max = 16777216
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 87380 16777216
EOF
if modprobe -q tcp_bbr; then
if modprobe -q tcp_bbr \
&& printf '%s\n%s' "4.20" "$(uname -r)" | sort -C -V; then
cat >> /etc/sysctl.conf <<'EOF'
net.core.default_qdisc = fq
net.ipv4.tcp_congestion_control = bbr

3
vpnsetup_ubuntu.sh
View File

@ -499,7 +499,8 @@ net.core.rmem_max = 16777216
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 87380 16777216
EOF
if modprobe -q tcp_bbr; then
if modprobe -q tcp_bbr \
&& printf '%s\n%s' "4.20" "$(uname -r)" | sort -C -V; then
cat >> /etc/sysctl.conf <<'EOF'
net.core.default_qdisc = fq
net.ipv4.tcp_congestion_control = bbr