Re: PQ questions

[Christian Benvenuti <christian.benvenuti@xxxxxxxxx>]

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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