1. 运行
sysctl net.ipv4.tcp_congestion_control输出
net.ipv4.tcp_congestion_control = cubic2. 运行
sysctl net.ipv4.tcp_available_congestion_control输出
net.ipv4.tcp_available_congestion_control = reno cubic开启BBR
命令行依次输入
grep -qxF 'net.core.default_qdisc=fq' /etc/sysctl.conf || echo 'net.core.default_qdisc=fq' >> /etc/sysctl.conf
grep -qxF 'net.ipv4.tcp_congestion_control=bbr' /etc/sysctl.conf || echo 'net.ipv4.tcp_congestion_control=bbr' >> /etc/sysctl.conf
sysctl -p如果配置文件中不存在以上相关配置，则新增。其中-q表示静默方式查找，-x表示匹配整行…
如果提示
sysctl: setting key "net.ipv4.tcp_congestion_control": No such file or directory说明内核中没有bbr，检查系统内核是否高于4.9哦
验证BBR是否开启成功
命令行输入
sysctl net.ipv4.tcp_congestion_control如果输出
net.ipv4.tcp_congestion_control = bbr
即表示BBR开启成功。
开启前后效果对比
这里跑了下superbench脚本
wget -qO- https://raw.githubusercontent.com/oooldking/script/master/superbench.sh | sudo bashVirMach VPS
VirMach Los Angeles启用BBR之前
----------------------------------------------------------------------
Superbench.sh -- https://www.oldking.net/350.html
Mode : Standard Version : 1.1.7
Usage : wget -qO- sb.oldking.net | bash
----------------------------------------------------------------------
CPU Model : QEMU Virtual CPU version (cpu64-rhel6)
CPU Cores : 2 Cores 2499.998 MHz x86_64
CPU Cache : 4096 KB
OS : Debian GNU/Linux 10 (64 Bit) KVM
Kernel : 4.19.0-6-amd64
Total Space : 1.1 GB / 45.0 GB
Total RAM : 53 MB / 1869 MB (367 MB Buff)
Total SWAP : 0 MB / 255 MB
Uptime : 0 days 15 hour 7 min
Load Average : 0.00, 0.00, 0.00
TCP CC : cubic
ASN & ISP : AS36352, ColoCrossing
Organization : Virtual Machine Solutions LLC
Location : Los Angeles, United States / US
Region : California
----------------------------------------------------------------------
I/O Speed( 1.0GB ) : 409 MB/s
I/O Speed( 1.0GB ) : 411 MB/s
I/O Speed( 1.0GB ) : 463 MB/s
Average I/O Speed : 427.7 MB/s
----------------------------------------------------------------------
Node Name Upload Speed Download Speed Latency
Speedtest.net 895.12 Mbit/s 409.90 Mbit/s (*)60.11 ms
Fast.com 0.00 Mbit/s 154.1 Mbit/s -
Nanjing 5G CT 176.96 Mbit/s 1865.96 Mbit/s 135.78 ms
Hefei 5G CT 0.49 Mbit/s 54.33 Mbit/s 153.14 ms
Guangzhou 5G CT 0.14 Mbit/s 1169.21 Mbit/s 175.24 ms
TianJin 5G CU 0.38 Mbit/s 37.82 Mbit/s 369.61 ms
Shanghai 5G CU 0.21 Mbit/s 1322.17 Mbit/s 254.40 ms
Guangzhou 5G CU FAILED Mbit/s 294.15 Mbit/s 322.03 ms
Tianjin 5G CM 0.24 Mbit/s 565.61 Mbit/s 253.24 ms
Hefei 5G CM 0.35 Mbit/s 707.64 Mbit/s 205.84 ms
Changsha 5G CM 0.92 Mbit/s 621.04 Mbit/s 213.99 ms
----------------------------------------------------------------------
Finished in : 6 min 28 sec
Timestamp : 2020-12-16 22:47:16 GMT+8
Results : ./superbench.logVirMach Los Angeles启用BBR之后
----------------------------------------------------------------------
Superbench.sh -- https://www.oldking.net/350.html
Mode : Standard Version : 1.1.7
Usage : wget -qO- sb.oldking.net | bash
----------------------------------------------------------------------
CPU Model : QEMU Virtual CPU version (cpu64-rhel6)
CPU Cores : 2 Cores 2499.998 MHz x86_64
CPU Cache : 4096 KB
OS : Debian GNU/Linux 10 (64 Bit) KVM
Kernel : 4.19.0-6-amd64
Total Space : 1.1 GB / 45.0 GB
Total RAM : 57 MB / 1869 MB (377 MB Buff)
Total SWAP : 0 MB / 255 MB
Uptime : 0 days 15 hour 20 min
Load Average : 0.05, 0.06, 0.02
TCP CC : bbr
ASN & ISP : AS36352, ColoCrossing
Organization : Virtual Machine Solutions LLC
Location : Los Angeles, United States / US
Region : California
----------------------------------------------------------------------
I/O Speed( 1.0GB ) : 511 MB/s
I/O Speed( 1.0GB ) : 391 MB/s
I/O Speed( 1.0GB ) : 478 MB/s
Average I/O Speed : 460.0 MB/s
----------------------------------------------------------------------
Node Name Upload Speed Download Speed Latency
Speedtest.net 687.04 Mbit/s 385.34 Mbit/s (*)55.80 ms
Fast.com 0.00 Mbit/s 137.0 Mbit/s -
Nanjing 5G CT 283.86 Mbit/s 1810.37 Mbit/s 137.77 ms
Hefei 5G CT 28.39 Mbit/s 71.54 Mbit/s 162.99 ms
Guangzhou 5G CT 0.34 Mbit/s 36.96 Mbit/s 170.26 ms
TianJin 5G CU 0.74 Mbit/s 0.40 Mbit/s 286.44 ms
Shanghai 5G CU 10.50 Mbit/s 1616.95 Mbit/s 232.41 ms
Tianjin 5G CM 11.46 Mbit/s 593.42 Mbit/s 234.04 ms
----------------------------------------------------------------------
Finished in : 4 min 45 sec
Timestamp : 2020-12-16 22:58:37 GMT+8
Results : ./superbench.log