Re: HFSC and default qdisc backlog

Linux Advanced Routing and Traffic Control

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James Nelson wrote:
Thanks for all of your help Patrick!
Just so I'm clear. If hfsc at the class level shows no overlimits and no
packet dropps, then hfsc is not effecting my traffic any different (from a
throughput perspective computational computer slowness aside) then if i had
no traffic shapping in place?

Noting what Patrick says as a caveat. But if you set up a rt class in hfsc at the moment (it may change soon) you can sort of get a feel for what's gone on historically by looking at the requeue counters (can't remember if tc -s class ls will do or tc -s qdisc ls with child queues on the class is needed).

If you have a rt class you probably don't want it to ever be backlogged - it won't be very rt anymore (OK you could have short queue & drop).

If a rt class has become backlogged in the past then you will see requeues - it may not be perfect, but I would say big number = bad, 0 = good.

Andy.
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