On Tuesday 13 August 2002 01:07, Tobias Geiger wrote:
> Arindam Haldar wrote:
> > hi Alex,
> > thanx so much.. :) .. thanx to all
> > my IMQ & htb3 test rules are working ok.. the best part--> imq handling
> > both in & out traffic now.. :)
>
> I also had this setup, and i also thought of it as a "cool thing" :)
> but then Patrick told me, that it's not so clever: the incoming traffic
> must pass 2 qdiscs (interface-qdisc and imq-qdisc) and this is bad/not
> good because
> 1) cpu - overhead (but this could be negleted) AND
> 2) these 2 qdiscs COULD drop packets and no one would know of the other
> having dropped s.th. -> retransmit
> ok. case 2 is not so realistic, as the qdisc on the interface normaly
> is the qfifo but nevertheless point 1) and the possibility of 2) made me
> think that queing double unnecessary.
Basic incoming shaping can be done with the ingress qdisc and the policers.
This is not a real qdisc with a queue, but it can throttle down incoming
packets without creating extra delays. It just droppes incoming packets
untill the wanted rate is reached.
Stef
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