[lfs-dev] sysctl net.core.default_qdisc=fq not affect bridge interace br0

xinglp xinglp at gmail.com
Sun Dec 18 05:06:18 PST 2016

Recently I try to use TCP BBR
My lfs is latest systemd version.

after the below command and reboot
sudo bash -c 'echo "net.core.default_qdisc=fq" >> /etc/sysctl.conf'
sudo bash -c 'echo "net.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf'

$ tc qd
qdisc noqueue 0: dev lo root refcnt 2
qdisc fq 0: dev enp0s25 root refcnt 2 limit 10000p flow_limit 100p
buckets 1024 orphan_mask 1023 quantum 3028 initial_quantum 15140
refill_delay 40.0ms
qdisc noqueue 0: dev br0 root refcnt 2

The br0 was not affected. But I can add it manually by 'tc qd add dev
br0 root fq'

Is it a kernel issue or systemd issue?

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