On Wednesday 20 August 2003 12:50, 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....?
Hi Stef,The bandwidth parameter is the real link bandwidth like ethtook or mii-diag will show you.
Reffering to page < http://www.docum.org/stef.coene/qos/faq/cache/7.html
> I found a para as follows,
" CBQ is not always as accurate as it should be. See docum.org on the test page for some tests with bounded classes. The algorithm used by cbq is very "link sensitive". It calculates the link idle time and for that it needs the real link bandwidth, average packet size and some other parameters. But there calculations are not always accurate. So it's possible that you will get inaccurate results if you use CBQ to limit the traffic in a class. "
Here Iam slightly confused with real link bandwidth, Can I understand
that while creating CBQ we need interface bandwidth (ethtool, mii-diag)
and and while assigning the classes real link bandwidth is required. An
example will definately help me. Can you pls suggest a way to find real
link bandwidth....? As ethtool and mii-diag will only get the interface
bandwidth.
If you want to limit all traffic to the link bandwidth, you have to create a class that's bounded and with rate = link bandwidth. You can create non-bounded sub classes but the bandwidth will be limit by the bounded class to the link 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.
Regards -Raghu
Stef
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