Re: [LARTC] general shaping recommendations

[Damion de Soto <damion@snapgear.com>]

Hi Martin,
> There's no reason not to use ingress policers if you wish.  I would
> recommend, however, shaping on both the inbound and outbound traffic.

If I'm running a web proxy on the gateway, then I would need ingress policer to limit 
the download bandwith for web requests.
How will the ingress policer on the WAN interface interact with the other egress htb 
classes on the LAN interface ?

> I'm fairly certain that the above is not what you desire.  When you
> specify a "rate" in a class, that class will ALWAYS consume up to that
> available amount of bandwidth before checking to see if the parent has any
> bandwidth to lend.  So, you will want to change this.
Ok, I see this and have fixed it.
So the wondershaper is wrong ?  it doesn't use the ceil values and creates rate 
values that sum up to a higher value than your ISP bandwidth.

>  [ snip ] classid 1:1 htb rate 512kbit burst 6k
>  [ snip ] classid 1:10 htb rate 256kbit ceil 512kbit burst 6k prio 1
>  [ snip ] classid 1:20 htb rate  96kbit ceil 460kbit burst 6k prio 2
>  [ snip ] classid 1:30 htb rate  96kbit ceil 409kbit burst 6k prio 2
> 
> Look at the sum of the rates of the children classes, this is
> class   1:10  1:20  1:30
> $ expr   256 +  96 +  96
> 448
Did you just guess at the ceiling numbers, or did you calculate them using some method?

> I don't know if my explanation will help, but check out my description of
> the HTB model [1].  Be sure to read Martin Devera's description [2], and
> also consider Stef Coene's documentation [3] and tests [4].  His tests
> show how bandwidth is distributed/allocated under various
> conditions--essentially these graphs provide a good way to understand the
> behaviour of HTB.

Thanks, I didn't realise there was a 'LARTC HOWTO' and a 'Traffic Control HOWTO'
The latter is much more useful and the diagrams are very helpful.


regards,

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