Re: [GIT PULL v2] Open vSwitch

On Wed, 2011-11-23 at 09:12 +0100, Eric Dumazet wrote:

I had no time to look at OVS, but current tc model is not scalable,
everything is performed under a queue lock.
Maybe its time to redesign a new model, based on modern techniques.

Making the enqueur/dequeuer lockless would be a big win. What happened
to your idea of ring buffer?
What other hot areas do you see? It used to be ingress/egress share
the qdisc lock - but that is now gone.

By the way, we seriously lack good documentation on tc, not counting
many features. Code might be there, but without documenation, working
samples, who can use it ?

Take a look at last cls_flow extension, and try to use it on a real
setup, you'll find its almost not possible...

There's no tc-central.org unlike the nice effort the netfilter guys have
put over the years. Documentation is there - sometimes a little too much
with differing "opinions" (lartc that Herbert pointed to is a good
starting point); but googling also helps. 
Unfortunately, sometimes the people who understand stuff have no
motivation to do docs.

cheers,
jamal