[Bloat] Notes about hacking on AQMs

[Jesper Dangaard Brouer]

On Thu, 2011-06-09 at 18:14 +0200, Eric Dumazet wrote:
> Le jeudi 09 juin 2011 à 12:04 -0400, Jesper Dangaard Brouer a écrit :
> > On Wed, 2011-06-08 at 18:41 +0200, Eric Dumazet wrote:
> > 
> > > BTW, latest stuff uses DRR & HFSC ;)
> > > 
> > > Patrick sample script is here :
> > > http://people.netfilter.org/kaber/shaping
> > 
> > I'll add a sample script to the collection:
> >  http://people.netfilter.org/hawk/shaper-example/qos-DRR-example
> > 
> > I did that script as a consultant task.  Its based on HTB + DRR + SFQ.
> > The customer was a large apartment building complex, which wanted to
> > provide fair queue scheduling.  The residents could choose between two
> > Internet subscriptions a "small" upto 100Mbit/s shared, and a "big" upto
> > 390 Mbit/s shared.  Within each group they achieve fair sharing via DRR.
> > And each DRR subqueue is a SFQ queue to give the person fair sharing
> > between his "own" traffic (or if the hash clash and several users get in
> > the same queue).
> 
> Hi !
> 
> I can see some strange limits in your sfq :
> 
> fun_tc qdisc add dev ${DEV} parent 1:50 handle 4250: \
>     sfq perturb 10 limit 256
> 
> AFAIK SFQ max limit is 128. Are you using a custom SFQ ?

Nope, no custom SFQ, I guess I just got the parameters wrong... I though
could increase the queue size this way, but I guess I'm wrong.