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расширенные общие приложения (CAKE) (Common Applications Kept Enhanced (CAKE))

PRIORITY QUEUE PARAMETERS

CAKE can divide traffic into "tins" based on the Diffserv field. Each tin has its own independent set of flow-isolation queues, and is serviced based on a WRR algorithm. To avoid perverse Diffserv marking incentives, tin weights have a "priority sharing" value when bandwidth used by that tin is below a threshold, and a lower "bandwidth sharing" value when above. Bandwidth is compared against the threshold using the same algorithm as the deficit-mode shaper.

Detailed customisation of tin parameters is not provided. The following presets perform all necessary tuning, relative to the current shaper bandwidth and RTT settings.

besteffort Disables priority queuing by placing all traffic in one tin.

precedence Enables legacy interpretation of TOS "Precedence" field. Use of this preset on the modern Internet is firmly discouraged.

diffserv4 Provides a general-purpose Diffserv implementation with four tins: Bulk (CS1, LE in kernel v5.9+), 6.25% threshold, generally low priority. Best Effort (general), 100% threshold. Video (AF4x, AF3x, CS3, AF2x, CS2, TOS4, TOS1), 50% threshold. Voice (CS7, CS6, EF, VA, CS5, CS4), 25% threshold.

diffserv3 (default) Provides a simple, general-purpose Diffserv implementation with three tins: Bulk (CS1, LE in kernel v5.9+), 6.25% threshold, generally low priority. Best Effort (general), 100% threshold. Voice (CS7, CS6, EF, VA, TOS4), 25% threshold, reduced Codel interval.

fwmark MASK This options turns on fwmark-based overriding of CAKE's tin selection. If set, the option specifies a bitmask that will be applied to the fwmark associated with each packet. If the result of this masking is non-zero, the result will be right-shifted by the number of least-significant unset bits in the mask value, and the result will be used as a the tin number for that packet. This can be used to set policies in a firewall script that will override CAKE's built-in tin selection.