From mboxrd@z Thu Jan  1 00:00:00 1970
From: Raghuveer <raghuveer-rc@naturesoft.net>
Date: Thu, 21 Aug 2003 04:57:54 +0000
Subject: Re: [LARTC] CBQ_bandwidth
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To: lartc@vger.kernel.org

Stef Coene wrote:

>On Wednesday 20 August 2003 14:58, Raghuveer wrote:
>  
>
>>What is confusing me is, there is a bandwidth provided by ISP (512Kbits)
>>and one ethernet capacity(100Mbits), so which one can we call as real
>>link bandwidth.  What is NIC bandwidth....is it ethernet bandwidth or
>>ISP bandwidth....?
>>    Lan------->eth1-----------eth0---------->Internet
>>Now at eth0 I have ethernet device bandwidth as 100Mbits and my ISP
>>provides 512Kbits bandwidth. so if I want to do egress traffic control
>>at both eth0 and eth1, what bandwidth I should consider...? My eth1
>>ethernet device bandwidth is 100Mbits.
>>    
>>
>What bout this :
>
>for all cbq commands : bandwidth 100mbit
>eth0
>  cbq qdisc
>    cbq class rate = 512kbit, bounded
>       cbq class 1, rate < 512kbit
>       cbq class ..., rate < 512kbit
>       cbq class x, rate < 512kbit
>So all traffic from class 1 ... x togehter is bounded to 512kbit.  
>
>eth1
>  cbq qdisc
>    cbq class rate = 100mbit, bounded
>       cbq class 1, rate 512kbit bounded
>          cbq class 10, rate < 512kbit
>          cbq class ..., rate < 512kbit
>          cbq class x, rate < 512kbit
>       cbq class 2, rate 99,5Mbit
>          cbq class 20, rate < 99,5Mbit
>          cbq class ..., rate < 99,5Mbit
>          cbq class x, rate < 99,5Mbit
>
>Class 1 is for all traffic from internet -> LAN
>Class 2 is for all traffic from shaper -> LAN
>
>And if you really want to be sure it's working, you should take 500kbit.  So 
>YOU are the bottleneck and in control of the link and not the modem.
>  
>
Thanks alot Stef, Its very clear to me now.
If I have ADSL with different incoming and outgoing rates. For egress 
shaping at WAN(eth0) interface, Whether should I use outgoing rates or 
combined rates (incomming + outgoing). Will it make any big difference 
if I use combined rates in an asymmetric link like cabel modem, ADSL etc.

Regards
-Raghu

>Stef
>
>  
>


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