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.
Stef
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