Re: DRR (Deficit Round Robin)

[Gamze Tunali <gtunali@hns.com>]

Hi,

Sandeep, thanks a lot for yor reply.. when I got this error, my DRR setting was:

$drrq set bucket_ 40
$drrq set limit_ 36000
$drrq set quantum_ 5120

So I think problem is not the number of buckets, has anybody an idea?

Thanks,

Gamze

--------------
Sandeep Bajaj wrote:

> "In reply to Gamze Tunali :"
> >
> > Hi all,
> >
> > I tried to use DRR and it always gave errors like (when I have 31 TCP
> > connections between 2 nodes, there is only 1 hop):
> >
> >   Collisions between 1 and 11 src addresses
> >   Collisions between 257 and 267 src addresses
>
> The problem is because the default number of DRR buckets is 10 and you have 31
> sources. So the hash function modulo the number of buckets produces collisions. Please increase the number of DRR buckets appropriately using :
>
> Queue/DRR set buckets_ <some sutiable number greater than 31>
>
> Sandeep.
>
> > I think the problem may be the hush function.. Why it uses this
> > function:
> >   ((i + (i >> 8) + ~(i>>4)) % ((2<<23)-1))+1;
> >
> > If this function produces the same number for two different flowids than
> > I guess collision error is given. Could somebody help me to understand
> > what is going on?
> >
> > Thanks
> >
> > Gamze Tunali
> >
> >
> >