openstack-manuals/doc/config-reference/source/tables/neutron-qos.rst

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Description of QoS configuration options
Configuration option = Default value Description
[QOS]
kernel_hz = 250 (Integer) Value of host kernel tick rate (hz) for calculating minimum burst value in bandwidth limit rules for a port with QoS. See kernel configuration file for HZ value and tc-tbf manual for more information.
tbf_latency = 50 (Integer) Value of latency (ms) for calculating size of queue for a port with QoS. See tc-tbf manual for more information.