Re: [LARTC] Quantum of class nnnnn is big

[Patrick Turley <pturley@rocksteady.com>]

I ran into this problem as well. Here's something quoted from our bug 
database that came from the research I did:


---

This message comes from the root qdisc when we attach a class to it. It 
examines the data rate of the subordinate class and computes the 
"quantum" for that class.

A "quantum" is the unit of sharing for bandwidth allocation. It is the 
number of bytes the the root qdisc will collect at one time from a given 
class before moving on to the next one. It's important that the quantum 
be at least 1500, since that's the maximum size of an Ethernet packet.

The root qdisc computes the quantum size for a class by dividing its 
data rate, expressed in bits per second, by a configurable constant 
called "r2q" (short for rate to quantum). The default value for this 
constant is 10, but you can set it to anything you want.

---


So, it looks like the quantum being computed for you is very large, and 
the message is suggesting that you reduce the value of r2q so the 
quantum isn't so big.

According to Stef's FAQ at
http://qos.dyndns.org:3389/cgi-bin/fom?_highlightWords=r2q&file1, the 
buit-in limit for the quantum is 60000 bytes.


Luciano Lima wrote:
> My gateway is showing these messages:
> 
> htb*g jI29
> htb*r7 m=0
> htb*r6 m=0
> htb*r5 m=0
> htb*r4 m=0
> htb*r3 m=0
> htb*r2 m=0
> htb*r1 m=0
> htb*r0 m=0
> HTB: quantum of class 10001 is big. Consider r2q change.
> 
> What does it means ?
> 
> Thanks,
> 
> Luciano Lima
> 
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