* Re: [LARTC] Quantum of class nnnnn is big
2004-01-20 14:24 [LARTC] Quantum of class nnnnn is big Luciano Lima
@ 2004-01-20 17:43 ` Stef Coene
2004-01-20 19:14 ` Patrick Turley
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: Stef Coene @ 2004-01-20 17:43 UTC (permalink / raw)
To: lartc
On Tuesday 20 January 2004 16:11, 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 ?
Lower the quantum:)
You can ignore these messages or change the quantum of your classes or r2q of
your htb qdisc. For an explanation, see
http://docum.org/stef.coene/qos/faq/cache/31.html
Make sure 1500 < quantum < 60000
quantum = rate / r2q
Stef
--
stef.coene@docum.org
"Using Linux as bandwidth manager"
http://www.docum.org/
#lartc @ irc.openprojects.net
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^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [LARTC] Quantum of class nnnnn is big
2004-01-20 14:24 [LARTC] Quantum of class nnnnn is big Luciano Lima
2004-01-20 17:43 ` Stef Coene
@ 2004-01-20 19:14 ` Patrick Turley
2004-01-21 16:18 ` rubens
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: Patrick Turley @ 2004-01-20 19:14 UTC (permalink / raw)
To: lartc
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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>
>
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^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [LARTC] Quantum of class nnnnn is big
2004-01-20 14:24 [LARTC] Quantum of class nnnnn is big Luciano Lima
2004-01-20 17:43 ` Stef Coene
2004-01-20 19:14 ` Patrick Turley
@ 2004-01-21 16:18 ` rubens
2004-01-22 19:49 ` Stef Coene
2004-01-22 20:11 ` Stef Coene
4 siblings, 0 replies; 6+ messages in thread
From: rubens @ 2004-01-21 16:18 UTC (permalink / raw)
To: lartc
> Make sure 1500 < quantum < 60000
> quantum = rate / r2q
Stef,
Would it be 1500 < quantum, or 1500 <= quantum ?
Rubens
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [LARTC] Quantum of class nnnnn is big
2004-01-20 14:24 [LARTC] Quantum of class nnnnn is big Luciano Lima
` (2 preceding siblings ...)
2004-01-21 16:18 ` rubens
@ 2004-01-22 19:49 ` Stef Coene
2004-01-22 20:11 ` Stef Coene
4 siblings, 0 replies; 6+ messages in thread
From: Stef Coene @ 2004-01-22 19:49 UTC (permalink / raw)
To: lartc
On Wednesday 21 January 2004 17:18, rubens@etica.net wrote:
> > Make sure 1500 < quantum < 60000
> > quantum = rate / r2q
>
> Stef,
>
> Would it be 1500 < quantum, or 1500 <= quantum ?
No, 1500 < quantim < 60.000. So quantum must be at least 1500, that's the
maximum packet size. And < 60000 and this is hard decoded in htb to prevent
cass starvation.
Stef
--
stef.coene@docum.org
"Using Linux as bandwidth manager"
http://www.docum.org/
#lartc @ irc.openprojects.net
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^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [LARTC] Quantum of class nnnnn is big
2004-01-20 14:24 [LARTC] Quantum of class nnnnn is big Luciano Lima
` (3 preceding siblings ...)
2004-01-22 19:49 ` Stef Coene
@ 2004-01-22 20:11 ` Stef Coene
4 siblings, 0 replies; 6+ messages in thread
From: Stef Coene @ 2004-01-22 20:11 UTC (permalink / raw)
To: lartc
On Wednesday 21 January 2004 17:18, rubens@etica.net wrote:
> > Make sure 1500 < quantum < 60000
> > quantum = rate / r2q
>
> Stef,
>
> Would it be 1500 < quantum, or 1500 <= quantum ?
I checked the htb code in kernel 2.6.1:
if quantum < 1000 or quantum > 200000, an eror is logged.
Stef
--
stef.coene@docum.org
"Using Linux as bandwidth manager"
http://www.docum.org/
#lartc @ irc.openprojects.net
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^ permalink raw reply [flat|nested] 6+ messages in thread