Re: cbq+ppp0

From: Andy Furniss (firstname.lastname_at_dsl.pipex.com)
Date: 08/29/05 

Date: Sun, 28 Aug 2005 23:16:03 +0100

Damir Galic wrote:
> I think that transfers are so radical because cbq is working on average
> speeds while my isp for example is doing some ceil limiting (that's where I
> see clean line on du-meter). So the question is, can cbq do souch limiting?
> Like working on ceil limit instead average.

If your isp gives you variable bandwidth then doing QOS is going to be
hard.

What sort of connection do you have, what bitrate is it sold as?

It could be as you say - I use htb which doesn't burst much unless you
tell it to.

Try looking at pppstats -w1 at the same time as dumeter.

>
> "Andy Furniss" <firstname.lastname@dsl.pipex.com> wrote in message
> news:43122105$0$6476$cc9e4d1f@news-text.dial.pipex.com...
>
>>Damir Galič wrote:
>>
>>>I have some questions about cbq.
>>
>>I don't use cbq so can't say about it's behaviour.
>>
>> Why are transfers so radical when limiting
>>
>>>"korenje upload" to 512kbit. when watching with dumeter, the transfers
>>>are sometimes 600kbit/s, sometimes 300kbit/s but average still around
>>>480kbit/s... when I set limits to 256kbit the transfers are steady, I see
>>>smooth line on du-meter.
>>
>>Possibly because du meter sees the flow as it is sent to the queue at lan
>>speed - tcp can burst like this, it doesn't mean that cbq releases the
>>packets like this. Use pppstats to see that.
>>
>>
>>>second problem is, why limiting internet traffic sent to local linux
>>>won't work? I can see packets being marked so it should work, but it
>>>doesn't.
>>
>>Without patching you can't have queues for incomming traffic on an
>>interface. You can use policers to measure rate and drop packets.
>>
>>If you want a real queue you need to use imq - www.linuximw.net or a
>>modified dummy device.
>>
>>Andy.
>
>
>

Relevant Pages

  • Re: cbq+ppp0
    ... I think that transfers are so radical because cbq is working on average ... speeds while my isp for example is doing some ceil limiting (that's where I ... can cbq do souch limiting? ...
    (comp.os.linux.networking)
  • Re: cbq+ppp0
    ... I don't use cbq so can't say about it's behaviour. ... Why are transfers so radical when limiting ... Possibly because du meter sees the flow as it is sent to the queue at ... I can see packets being marked so it should work, ...
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