Re: HFSC and default qdisc backlog

Linux Advanced Routing and Traffic Control

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James Nelson wrote:
> I don't understand the following:
>  
> root@jmnrouter:~# tc -s class ls dev vlan1 && tc -s qdisc ls dev vlan1
> class hfsc 1: root
>  Sent 0 bytes 0 pkts (dropped 0, overlimits 0)
>  period 0 level 2
>  
> class hfsc 1:1 parent 1: sc m1 0bit d 0us m2 220000bit ul m1 0bit d 0us m2
> 220000bit
>  Sent 0 bytes 0 pkts (dropped 0, overlimits 0)
>  period 31304 work 7533852 bytes level 1
>  
> class hfsc 1:10 parent 1:1 sc m1 1024bit d 8.0ms m2 100000bit ul m1 0bit d
> 0us m2 220000bit
>  Sent 6892869 bytes 33300 pkts (dropped 0, overlimits 0)
>  period 32750 work 6892869 bytes rtwork 6725586 bytes level 0
>  
> class hfsc 1:20 parent 1:1 sc m1 4096bit d 100.0ms m2 75000bit ul m1 0bit d
> 0us m2 220000bit
>  Sent 0 bytes 0 pkts (dropped 0, overlimits 0)
>  period 0 level 0
>  
> class hfsc 1:30 parent 1:1 sc m1 8200bit d 200.0ms m2 30000bit ul m1 0bit d
> 0us m2 220000bit
>  Sent 640821 bytes 636 pkts (dropped 0, overlimits 0)
>  period 277 work 640821 bytes rtwork 199829 bytes level 0
>  
> class hfsc 1:40 parent 1:1 sc m1 8200bit d 300.0ms m2 15008bit ul m1 0bit d
> 0us m2 220000bit
>  Sent 162 bytes 3 pkts (dropped 0, overlimits 0)
>  period 3 work 162 bytes rtwork 162 bytes level 0
>  
> qdisc hfsc 1: default 30
>  Sent 7537524 bytes 33953 pkts (dropped 6, overlimits 4145)
>  backlog 3p
> 
>  
> Why is the qdisc backloged with dropped packets and overlimits when the
> classes are not?

You seen to be using an old iproute version. There was some
compatibility breakage that affected statistics.
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