[LARTC] classless qdisc and classful qdisc

[LARTC] classless qdisc and classful qdisc

[Ismail Fahmi]

[-- Attachment #1.1: Type: text/plain, Size: 539 bytes --]

Hello, I'm still new in using tc...I wanna ask...

1. what is the difference between classless and classful qdisc?? when I made
a qdisc, are I must create both of that qdisc...???

2. what is the difference beetween three of the classless qdisc in linux
redhat 2.4, sfq pfifo and tbf if I using the htb classful qdisc ??? because
when I use htb classful qdisc it means I made a qdisc that can rate b/w for
each class, so it's no difference between I used tbf classless qdisc in each
class and I used sfq or pfifo...

-regards-

[-- Attachment #1.2: Type: text/html, Size: 554 bytes --]

[-- Attachment #2: Type: text/plain, Size: 143 bytes --]

_______________________________________________
LARTC mailing list
LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc

Re: [LARTC] classless qdisc and classful qdisc

[Andreas Klauer]

On Sun, Jan 22, 2006 at 07:07:32PM +0700, Ismail Fahmi wrote:
> 1. what is the difference between classless and classful qdisc?? when I made
> a qdisc, are I must create both of that qdisc...???

A classful qdisc allows packets to be sorted into different groups, and to 
handle packets differently depending on the group they belong to. This gives 
you a lot of control over how packets of a certain type / belonging to a 
certain user / etc. should be treated.

A classless qdisc just takes all incoming packets and treats them essentially 
all the same (with some exceptions). You can't manually customize or group 
type of packets in any way.

> 2. what is the difference beetween three of the classless qdisc in linux
> redhat 2.4, sfq pfifo and tbf if I using the htb classful qdisc ??? because
> when I use htb classful qdisc it means I made a qdisc that can rate b/w for
> each class, so it's no difference between I used tbf classless qdisc in each
> class and I used sfq or pfifo...

Not sure if I got this question right. Are you asking what the difference 
between limiting bandwidth using HTB and TBF is? In that case, TBF is classless, 
doesn't know anything at all about other traffic, and will just stupidly limit 
the bandwidth to a certain value. HTB on the other hand knows about its classes 
and can balance the total available bandwidth between them.

HTH
Andreas Klauer
_______________________________________________
LARTC mailing list
LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc