[LARTC] overlimits value in statistics

[LARTC] overlimits value in statistics

[Igor Suvorov]

Good Day!

I was interested with a question what exactly
is considered in overlimits parameter to count
of statistics. I thought, that this parameter
should specify number of the packages which
have exceeded valid boundary. But, for example
statistics on one of queues:

class cbq 20:12 parent 20:10 leaf 8015: rate 128Kbit (bounded) prio 5
 Sent 23171746615 bytes 43153460 pkts (dropped 81179, overlimits 641814686) 
 backlog 1p 

Queue has passed 43153460 packets, but has
exceeded a valid level of 641814686 packets.
What it? Errors?

--
Igor

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Re: [LARTC] overlimits value in statistics

[Stef Coene]

On Sunday 08 September 2002 06:43, Igor Suvorov wrote:
> Good Day!
>
> I was interested with a question what exactly
> is considered in overlimits parameter to count
> of statistics. I thought, that this parameter
> should specify number of the packages which
> have exceeded valid boundary. But, for example
> statistics on one of queues:
I have some more info on www.docum.org (FAQ page) :

overlimits : Packet is not sended due to ceil or rate restrictions 
So there was to much data in the class. But don't believe this too much. It 
depends on how often the qdisc looked for packet. This counter is incremented 
per unsucessfull DRR loop and it's possible that this happens more then once 
per packet. 
Each dropped packet is overlimited. 

> class cbq 20:12 parent 20:10 leaf 8015: rate 128Kbit (bounded) prio 5
>  Sent 23171746615 bytes 43153460 pkts (dropped 81179, overlimits 641814686)
>  backlog 1p
>
> Queue has passed 43153460 packets, but has
> exceeded a valid level of 641814686 packets.
> What it? Errors?

Stef

-- 

stef.coene@docum.org
 "Using Linux as bandwidth manager"
     http://www.docum.org/
     #lartc @ irc.oftc.net

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[LARTC] overlimits value in statistics

[Igor Suvorov]

Good Day, Stef!

Sunday, September 8, 2002, 1:57:43 PM, you wrote:

>> I was interested with a question what exactly
>> is considered in overlimits parameter to count
>> of statistics. I thought, that this parameter
>> should specify number of the packages which
>> have exceeded valid boundary. But, for example
>> statistics on one of queues:

SC> I have some more info on www.docum.org (FAQ page) :

SC> overlimits : Packet is not sended due to ceil or rate restrictions 
SC> So there was to much data in the class. But don't believe this too much. It 
SC> depends on how often the qdisc looked for packet. This counter is incremented 
SC> per unsucessfull DRR loop and it's possible that this happens more then once 
SC> per packet. 
SC> Each dropped packet is overlimited. 

Thus this parameter is really useless?

I have paid attention, that at speed of passinge of packages approximately 40 pps
growth rate of this parameter about (near) 150000 pps.

--
Igor

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