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Leandro Moreira
Asked: 2014-01-30 12:05:12 +0800 CST

Meaning of requeues of tc command

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I ran this tc bellow and it outputs requeues with high number, do you know what this requeues means? By the way, it keeps increasing over the time.

I look at man tc but I couldn't find anything.

$ tc -s qdisc ls dev em1
 qdisc mq 0: root
 Sent 1760345587651 bytes 1790125037 pkt (dropped 0, overlimits 0 **requeues 135812** ) 
 rate 0bit 0pps backlog 0b 0p **requeues 135812**
linux

1 Answers

  1. Best Answer

    It's the count the number of times a packet has been dequeued but not transmitted for some reason and is inserted back at the same position.

    If you're interested in the kernel source code: https://elixir.bootlin.com/linux/latest/A/ident/dev_requeue_skb. You can follow the logic and find exactly under what circumstances a requeue happens.

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