Role subpackages set the system-wide default qdisc and TCP congestion
control via /usr/lib/sysctl.d, without pulling in the base package:
server fq + bbr bare metal, VM guests
vmhost fq_codel + bbr hypervisors, container hosts
router fq_codel + cubic
desktop fq_codel + cubic
The base package applies cake per interface from
/etc/qos-profiles/<iface>.conf, layered over role defaults and
/etc/qos-profiles/defaults.conf:
- LINK_RATE with per-direction overrides, shaped to SHAPE_PERCENT
(default 95, per direction overridable)
- outbound fairness per source host and diffserv4; inbound via ifb,
fairness per destination host, besteffort with DSCP wash
- NAT awareness, extra cake args (shared and per direction), raw
qdisc overrides
- config parsed without executing it, validated before any change,
previous state undone on each run
Applied by the qos-profiles@<iface> unit (bound to the device) or the
qos-profiles-networkmanager dispatcher subpackage, installed
automatically on hosts with NetworkManager. Includes ready-made
examples for VM hosts, OVH dual-NIC servers, DC and home routers.
