Re: [LARTC] What is: "Consider r2q change"

["m.innocenti@cineca.it" <m.innocenti@cineca.it>]

Oliver Schulze L. ha scritto:
> I'm getting this warning/error in /var/log/messages:
> May 26 18:21:05 mail kernel: HTB: quantum of class 10010 is small. 
> Consider r2q change.
> Its a big deal? What should I do?

If I understand the source, that message occours when you have a leaf 
class whose calculated quantum (rate/r2q) is less than 1000 byte and the 
kernel set the quantum to 1000 byte.
I've read that the quantum should be bigger than the MTU so I don't 
understand why the kernel don't use a minimum quantum value bigger than 
1500. Someone has a clue?

 From kernel-source-2.6.10/net/sched/sch_htb.c
if (!hopt->quantum && cl->un.leaf.quantum < 1000) {
    printk(KERN_WARNING "HTB: quantum of class %X is small. Consider r2q 
change.\n", cl->classid);
    cl->un.leaf.quantum = 1000;



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Marco Innocenti              Gruppo Infrastruttura e Sicurezza
CINECA                       phone:+39 0516171553 / fax:+39 0516132198
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