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From: Patrick Nagelschmidt <dto@gmx.net>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] CBQ only works 'bounded'
Date: Fri, 07 Dec 2001 13:19:20 +0000	[thread overview]
Message-ID: <marc-lartc-100773146110244@msgid-missing> (raw)
In-Reply-To: <marc-lartc-100768870231848@msgid-missing>

At 07.12.01, you wrote:
>You talk to your modem over a 10mbit/s interface? 

yes, it's pppoe. and i can recycle my old ne2k cards this way :)

>Cool. You weren't possible to do this before?

no, a normal 16kb/s upload ruined the whole download speed. i loose ~60%
of my downstream if i dont use QoS.

>Ok - you can still upload and download, but the positive effect disappears?

exactly. it's nearly the same as if i wouldn't start the script at all.

>Well, CBQ isn't all *that* precise. Bandwidth is sucked out of your
>interactive class for certain chunks of time, again delaying ACKs. In the
>long term, bandwidth will probably be available ok for your interactive
>class but downloads get hurt even if ACKs get delayed in the short term.

that seems to be the point. the low priority class only borrowed 844 packets
out of ~18000 but that was enough to delay acks remarkably. but now i can be
sure that it is a logistic problem, not a fundamental error in my script.

>I've been experimenting with HTB and it appears to be better in this
>respect. Even without priorities it managed to keep latency in the
>interactive class *very* low.

but i read in your howto, that it will divide remaining bandwidth in a ratio
based on the size of the classes. so this would mean it would devide it in
a 108:20 ratio. if it does the low priority class gets the bigger part and
i might have the same problem again. or do i underestimate HTB? :)

>One thing, try reversing the priorities

i tried it, but this hadn't a positive effect. isn't 1 the highest and 7 the 
lowest? 

regards,

Patrick


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  parent reply	other threads:[~2001-12-07 13:19 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-12-07  1:29 [LARTC] CBQ only works 'bounded' Patrick Nagelschmidt
2001-12-07 11:13 ` bert hubert
2001-12-07 13:19 ` Patrick Nagelschmidt [this message]
2001-12-07 14:33 ` Michael T. Babcock
2001-12-07 15:26 ` bert hubert
2001-12-07 15:38 ` Patrick Nagelschmidt
2001-12-07 15:57 ` Martin Devera

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