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Author: Admin | 2025-04-28
This block are then attached filters using the "tc block BLOCK_IDX" syntax. The block is executed when the qevent associated with the attachment point takes place. For example, packet could be dropped, or delayed, etc., depending on the qdisc and the qevent in question. For example: tc qdisc add dev eth0 root handle 1: red limit 500K avpkt 1K \ qevent early_drop block 10 tc filter add block 10 matchall action mirred egress mirror dev eth1CLASSLESS QDISCS top The classless qdiscs are: choke CHOKe (CHOose and Keep for responsive flows, CHOose and Kill for unresponsive flows) is a classless qdisc designed to both identify and penalize flows that monopolize the queue. CHOKe is a variation of RED, and the configuration is similar to RED. codel CoDel (pronounced "coddle") is an adaptive "no-knobs" active queue management algorithm (AQM) scheme that was developed to address the shortcomings of RED and its variants. [p|b]fifo Simplest usable qdisc, pure First In, First Out behaviour. Limited in packets or in bytes. fq Fair Queue Scheduler realises TCP pacing and scales to millions of concurrent flows per qdisc. fq_codel Fair Queuing Controlled Delay is queuing discipline that combines Fair Queuing with the CoDel AQM scheme. FQ_Codel uses a stochastic model to classify incoming packets into different flows and is used to provide a fair share of the bandwidth to all the flows using the queue. Each such flow is managed by the CoDel queuing discipline. Reordering within a flow is avoided since Codel internally uses a FIFO queue. fq_pie FQ-PIE (Flow Queuing with Proportional Integral controller Enhanced) is a queuing discipline that combines Flow Queuing with the PIE AQM scheme. FQ-PIE uses a Jenkins hash function to classify incoming packets into different flows and is used to provide a fair share of the bandwidth to all
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