Re: [LARTC] HTB statistics

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

m.innocenti@cineca.it wrote:
> Andy Furniss wrote:
> 
>>>     there is something I'm not able to understand about HTB statistics.
>>> Why the qdisc show show how many packets are overlimits but in the
>>> classes there are always 0 packets overlimits or dropped?
>>
>> Overlimits is more a kernel thing then usefull as a traffic control 
>> figure and tc qdisc -s .. shows the root 1: htb but tc -s class doesn't.
>> You can see drops with tc -s class - but the default htb queue is too 
>> long in this test. Add a specific queue to the class 1:10 so you can 
>> specify length. eg.
>> tc qdisc add dev eth0 parent 1:10 handle 10: bfifo limit 64k
> 
> 
> Thank you for your reply. So there is not a way to know that a specific 
> class is actually shaping the traffic without attaching a qdisc to each 
> class?
> 
> 
Well the fact you are backlogged shows queue length - just default 
length htb uses in this test is so long it doesn't drop.

If you had more classes they would be shorter and drop.

Adding a queue just lets you choose length - you won't really see any 
better stats though you see more with tc -s qdisc.

You can also use tc -s class and look at the borrowed/lended counts and 
see what you can deduce from those.

Andy.

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