Re: [LARTC] CBQ and WRR

Linux Advanced Routing and Traffic Control

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On Tue, 27 Mar 2001, Christian Worm Mortensen wrote:

>
> Yes, but in the howto also a qdisc named WRR is mentioned.

What HOWTO? Is this one of those schedulers that Martin wrote? Never
paid much attention; Maybe because i never thought that WRR was important
once we had DRR.

>
> A quick search on Google BTW said that DRR is only better in terms
> of speed of the implementation but is worse in terms distribution bandwidth.

WRR works well when you apriori know the packet/cell sizes (eg in ATM).
If you cant do this, then WRR is unfair once you start having a lot of
flows going or you mistweak your weights etc. DRR fixes this. The
improvements on computation comes in as a bonus _not_ as the advantage of
DRR over WRR.
Why dont you read the classical paper at:
http://www.acm.org/sigcomm/sigcomm95/papers/shreedhar.html

cheers,
jamal




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