Re: [LARTC] Classless Queues in series...

["Martin A. Brown" <mabrown-lartc@securepipe.com>]

Ben,

 : I need (or would at lest live very much :) to use two Classless Queues
 : in series.
 :
 : I can't see in the HOWTO how this is done, but guess at something like:
 :
 : tc qdisc add dev eth0 root handle 1: sfq (etc)
 : tc qdisk add dev eth0 parent 1: tbf (etc)
 :
 : Am I on the right lines here?

A classless queueing discipline cannot contain another queueing
discipline.

A classful queueing discipline can contain classes and leaf queueing
disciplines.

In other words:

  - a classless queueing discipline is by definition, a terminal qdisc
  - a classful queueing discipline can be terminal or
    - can contain a class, which can be terminal or
      - can contain another queueing discipline

Does that help?


 : I also have a small problem with TBF...  From the HOWTO sec 9.2.2, it is
 : surgested that a value for the 'burst' should be:
 :
 : "For 10mbit/s on Intel, you need at least 10kbyte buffer if you want to
 : reach your configured rate!"
 :
 : Therefore: burst => rate * (8 / 1000)
 :
 : However, I find using this I get stall on ftp and other common
 : protocols, when they get above the throttle rate, with low bandwidths
 : (eg, 64kbit/sec).  --  Or I completelly fail to understand the above
 : statement...
 :
 : Does any person have a better method for calculating a good value for
 : 'buffer' ?

I'm afraid I can't help you on this question.

-Martin

-- 
Martin A. Brown --- SecurePipe, Inc. --- mabrown@securepipe.com

_______________________________________________
LARTC mailing list / LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/