Stef Coene wrote: >On Wednesday 20 August 2003 12:50, Raghuveer wrote: > > >>Hi Stef, >> >>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. >> >> >The bandwidth parameter is the real link bandwidth like ethtook or mii-diag >will show you. >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. > > 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. Regards -Raghu >Stef > > >
