Re: [LARTC] HFSC and default qdisc backlog

[Patrick McHardy <kaber@trash.net>]

Jason Boxman wrote:
> On Wednesday 22 March 2006 19:13, 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?
> 
> 
> Well, surely if you're not delaying or dropping any traffic on your side of 
> the pipe, you're either using less bandwidth than you have or you've 
> overstated the true size of your upstream link.  In either case, no shaping 
> can occur as ordering packets has little effect if there's no bottleneck.

Not exactly. Overlimit means no eligible class could be found because
_all_ classes are over their limits, it can't be accounted to a specific
class but only globally. There is no way (except for backlog
statistics, but backlogs can also happen because of other reasons)
to tell if a single class is affected by rate limiting or not.
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