[Bloat] Notes about hacking on AQMs

[Jesper Dangaard Brouer]

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).


On Wed, 2011-06-08 at 14:56 +0200, Eric Dumazet wrote:

> Hmm, since 2007 SFQ has all ESFQ provided, if you use a flow classifier,
> you can exactly match your needs.
> 
> [ SFQ uses an internal flow classifer on
> src,dst,proto,proto-src,proto-dst ]
> 
> Say you want to make something only about dst addresses :
> 
> tc filter add ... flow hash \
>   	keys dst divisor 1024
> 
> With recent SFQ, you can play with a divisor in [256 .. 65536]
> 
> 
> Refs : 
> 
> http://lwn.net/Articles/236200/
> 
> http://www.nuclearcat.com/mediawiki/index.php/Linux_iproute2