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List:       lartc
Subject:    Re: [LARTC] jdg-qos & DSL
From:       Andy Furniss <lists () andyfurniss ! entadsl ! com>
Date:       2006-09-27 0:08:52
Message-ID: 4519C114.3060400 () andyfurniss ! entadsl ! com
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acid_burn@x-privat.org wrote:
> hi all!
> 
> i have a dsl connection with 1280 kbps for downstream and 256 kbps for upstream, \
> and i want to manage the bandwidth to give high priority to voip traffic and low \
> priority to p2p traffic. i found the script jdg-qos. i readed on this forum (i have \
> a dsl-g604t router with MCMCC firmware) \
> http://www.dslreports.com/forum/remark,16250220 that the two parameters of the \
> jdg-qos script (DWIFLIMIT and UPIFLIMIT) must be setted a few less than the theoric \
> dsl's downstream and upstream values (1280/256). but, how much few less? what are \
> the values i must assign to DWIFLIMIT and UPIFLIMIT?

For upstream it's possible to patch for atm overheads so you can in 
theory go really close to the limit. If you can't get the overheads 
right how much you have to back off from rate depends on your traffic 
pattern wrt packet sizes. If you have lots of small packets you will 
need to back off more than if most traffic is bulk.

For ingress, it depends more on how much you care about latency. Shaping 
from the wrong end of the bottleneck is not nice. You may need to 
sacrifice 20 - 50 % depending on latency requirements and traffic type - 
lots of connections/bittorrent etc being harder to shape than a few.

Andy.

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