HTB and HFSC,declaration tc command question

["*~ r a K u ~ *" <e1605project@xxxxxxxxxxx>]

I have a lot question about tc-command because now i'm doing research to compare

performance between HTB and  HFSC

so i'm doubt a lot thing and your reply are so very helpful to me ... My question is

 

In HTB tc command question
1. I'm use opensource (Mastershaper) for help to config traffic control

but when i'm try to config HTB,
I'm doubt about in each chain must identify fallback service level

and If i'm don't specify it,it will unable to contain pipe.

Every traffic and if traffic not matched in chain's pipe can only use the fallback service level

(ps.  Mastershaper represent interior class as pipe and leaf class as chain)

 

Is it only true definition in HTB tc command?? or it's only a creative function from developer??

 

In HFSC tc command question 

after i read HFSC paper , i'm doubt in Service curve declaration like this

> | SC := [ [ m1 BPS ] [ d SEC ] m2 BPS
> | 
> |  m1 : slope of first segment -> umax
> |  d  : x-coordinate of intersection -> dmax
> |  m2 : slope of second segment -> rate

 

2. In all leaf class must specify rt (realtime service curve) ??? and Is it important to

specify sc (Service curve) in all leaf class ?? and in all leaf class must specify link-sharing (ls) too??

because i think after read HFSC theory about by default All leaf class(Service class)

will use Link-sharing critirion for allocation bandwidth from Service curve

(My assumtion think this calculation bandwidth is "m1" or "umax" ->total bandwidth

that can send at ceil rate??) and when total  delay are exceed to "demax" or "d" -> it mean

it's time for HFSC to manage QoS to guarantee bandwidth and delay

in each leaf class by use Real-time Criterion so bandwidth rate will change to "m2"

or bandwidth rate that guarantee QoS in eache leaf class

Is it true??? i fear may be misunderstand in HFSC theory,

example in my test lab ,i have leaf class 3 type such real-time ,data ,default
Can i specify
 - real-time leaf class -> rt (for guatantee delay and bw) ,ls (by default when not exceed max delay)
 - data lead class ->  ls (by default and not delay sensitive so delay are not important)

3. I'm doubt in How to declaration ls, and ul about .. in thoery it a type of service curve that not

relative with real-criterion, so Delay may be not important for consider ????

Is it true when declaration, parameter in each service curve may be link this?
 ls [ umax BPS, rate BPS]
 ul [ umax BPS, rate BPS]

and

Is it important to declaration all of three parameter (umax,demax,rate) If three parameter
are important to setting traffic control????

 

3. I'm try to search HFSC command example, it have a lot case but i'm doubt in service curve (sc)

declaration sometime declaration in root class, interior class, in leaf class
so I'm not sure to understand about ls ->calculate bandwidth for interior class,root class and
rt -> calculate bandwidth for leaf class and what about service curve(sc)??? it's specify only in root class???

 

4. Is it true??
In root class, or interior class will doing with only Link-sharing criterion, so can specify declaration

only link-sharing ->ls(umax, dmax, rate) and Upperlimit ->ls(umanx,dmax,rate) it's not important

to declaration real-time curve (rt) because in HFSC theory will use real-time criterion only Leaf class

 

5. In HFSC, upper limit are bandwidth rate that guarantee maximum bandwidth rate in

each class as ceil in HTB???

 

6. I'm doubt about priority in HFSC, in HFSC paper telling about in support priority

but in HFSC tc-command it not specify priority in each class,

So In HFSC how to manage priority class link HTB????

Thank you for all reply, it's so very helpful to me alot.
which all will suggest or advise me about in something i'm misunderstand

 

raku

 

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