33 lines
1.1 KiB
Bash
33 lines
1.1 KiB
Bash
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#!/bin/sh
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# sets up BBR congestion control (https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=0f8782ea14974ce992618b55f0c041ef43ed0b78)
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# for the given interface
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DEV=${$1:=eth0}
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MODE=${$2:="temporary"}
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echo pre-run state:
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echo `sysctl net.ipv4.tcp_congestion_control`
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echo qdisc on $DEV: `tc qdisc show dev $DEV`
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# set required "fair queueing" queuing discipline (man tc-fq)
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echo "qdisc on $DEV was: `tc qdisc show dev $DEV`"
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tc qdisc replace dev $DEV root fq
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echo "qdisc on $DEV now is: `tc qdisc show dev $DEV`"
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# (permanently) configure BBR
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if [[ mode == "temporary" ]]; then
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echo -e 'net.core.default_qdisc=fq
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net.ipv4.tcp_congestion_control=bbr' | sysctl -p-
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elif [[ mode == "permanent"]]; then
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echo -e 'net.core.default_qdisc=fq
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net.ipv4.tcp_congestion_control=bbr' >> /etc/sysctl.d/20-net-bbr.conf
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sysctl -p /etc/sysctl.d/20-net-bbr.conf
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algo=`sysctl net.ipv4.tcp_congestion_control`
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if [[ "$algo" != 'net.ipv4.tcp_congestion_control = bbr' ]]; then
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echo "couldn't apply changes at runtime, you should reboot."
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fi
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else
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echo "unknown mode, congestion control algo unchanged"
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fi
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