netdev - Re: [GIT PULL v2] Open vSwitch

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Message-ID: <1322052938.17693.9.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC>
Date:	Wed, 23 Nov 2011 13:55:38 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	jhs@...atatu.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

Le mercredi 23 novembre 2011 à 07:47 -0500, jamal a écrit :
> 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?

Currently thinking about it. I was also waiting Tom Herbert BQL patches.

Several people are interested, and John Fastabend told me he plans to :

 (1) rcu'ify classifiers/actions as needed
 (2) add flag to drop qdisc lock on simple or hw qdiscs
 (3) mq and mqprio call root qdisc and run a pass over classifiers
     actions possibly resetting queue_mapping.



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