RE: Re: PQ questions

Linux Advanced Routing and Traffic Control

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Slightly offtopic... Has anyone really experienced starving of low
priority traffic with PRIO qdisc?
In my setup, I never achieved that, though I also wanted exactly that
situation. I gave both the classes same amount of traffic at the same
time. High prio got more bandwidth, but no starvation, even after I sent
more traffic than the link capacity.

> -----Original Message-----
> From: lartc-bounces@xxxxxxxxxxxxxxx
[mailto:lartc-bounces@xxxxxxxxxxxxxxx]
> On Behalf Of Christian Benvenuti
> Sent: Friday, June 15, 2007 3:32 PM
> To: lartc@xxxxxxxxxxxxxxx
> Subject:  Re: PQ questions
> 
> Hi,
> 
> > > Your config does not prevent an higher priority class from
starving
> > > a lower priority class.
> >
> > Exactly. That is requirement.
> 
> OK
> 
> > Those stats are nice to have, but the ones I must have are for how
many
> > bytes/packets are enqueued at whatever time I check the queues.
> 
> That information is there. Here is an example:
> (b=bytes p=packets)
> 
> #tc -s -d qdisc list dev eth1
> 
> qdisc prio 1:  root bands 3 priomap  1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1
>   Sent 85357186 bytes 59299 pkt (dropped 0, overlimits 0 requeues 0)
>   rate 0bit 0pps backlog 0b 35p requeues 0
>                          +-> This field is not initialized for this
>                              qdisc type
> qdisc pfifo 10:  parent 1:1 limit 1000p
>   Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
>  rate 0bit 0pps backlog 0b 0p requeues 0
>                 ^^^^^^^^^^^^^
> qdisc pfifo 20: parent 1:2 limit 1000p
>   Sent 85357120 bytes 59298 pkt (dropped 0, overlimits 0 requeues 0)
>  rate 0bit 0pps backlog 50470b 35p requeues 0
>                 ^^^^^^^^^^^^^^^^^^
> qdisc pfifo 30: parent 1:3 limit 1000p
>   Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
>   rate 0bit 0pps backlog 0b 0p requeues 0
>                  ^^^^^^^^^^^^^
> 
> > I have tried to configure PQ to have two queues per filter with no
> success.
> 
> What do you mean?
> 
> > Is it even possible to have (what I'll call) hierarchical PQ? I have
yet
> to
> > find it.
> 
> Something like this?
> 
> tc qdisc add dev eth1 handle 1: root prio
> tc qdisc add dev eth1 parent 1:1 handle 10 prio
> tc qdisc add dev eth1 parent 1:2 handle 20 prio
> tc qdisc add dev eth1 parent 1:3 handle 30 prio
> 
> Regards
> /Christian
> [ http://benve.info ]
> 
> 
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