Re: [LARTC] Info about VoiP Qos

[Ed Wildgoose <lists@wildgooses.com>]

> But i would like to have the possibility to use all the 400Kbps and slow
> down server traffic only when and if needed.
>
> I prioritized VoIP traffic, using the various scripts around, and what i
> get is that, even if voip quality is definitely much much better than
> without shaping, there are is still statics and pops, and some
> interruption of the voice and only if i'm called from POTS
> I do not get this when completely reserving the bandwith or when the
> link is not loaded.


You probably forgot to tweak the HTB code to change the hysterisis value?

This helps a lot with the output stuff.  However, remember that you 
always have to slow down the incoming to a little less than max 
otherwise by the time the stuff is throttled you see some small amount 
of queuing at the remote end.

Also remember that the bandwidth of most adsl links is less than the 
stated bandwidth.  This is because of ATM overheads (which vary 
depending on packet size) and also because the link is contended.

Put this all together and you should be able to get pretty close to 
maximum,. perhaps only reserving a small amount of bandwidth and make 
the rest shareable.

Good luck

Ed W
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