netdev - Re: [GIT PULL v2] Open vSwitch

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Date:	Wed, 23 Nov 2011 07:47:43 -0500
From:	jamal <hadi@...erus.ca>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	David Miller <davem@...emloft.net>, jesse@...ira.com,
	netdev@...r.kernel.org, dev@...nvswitch.org
Subject: 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

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