Re: [LARTC] HTB and PRIO qdiscs introducing extra latency when output

[Andy Furniss <andy.furniss@dsl.pipex.com>]

Jonathan Lynch wrote:
> Andy, Many thanks for your reply. Below is some output from the queueing
> disciplines to show that the filters are working correctly and they are
> going to the right classes.

OK classification looks good then.


> 
> pass_on means if no class id equal to the result of the filter is found
> then try next filter, which is the BE class in this case.

Ahh I'll have to play with this dsmark stuff one day :-)

> 
> So back to the main question, could anyone tell me why the delay is so
> high (30ms) for VoIP packets which are treated with the EF phb when the
> outgoing interface of core  router to network c is saturated ?

I would test next with htb setup like (assuming you are HZ\x1000 - you 
will be under rate if not) -

...

tc class add dev $1 parent 2:0 classid 2:1 htb rate 90Mbit ceil 90Mbit 
quantum 1500 burst 12k cburst 12k

tc class add dev $1 parent 2:1 classid 2:10 htb rate 1500kbit ceil 
90Mbit quantum 1500 burst 12k cburst 12k
...

tc class add dev $1 parent 2:1 classid 2:20 htb rate 5Mbit ceil 90Mbit 
quantum 1500 burst 12k cburst 12k

...


If that doesn't make things any better then you could try giving the 
2:10 class a rate alot higher than it needs and see if that helps.


Andy.

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