netdev - Re: Integration of Open vSwitch

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Date:	Thu, 1 Dec 2011 16:59:23 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Jesse Gross <jesse@...ira.com>, jhs@...atatu.com,
	netdev <netdev@...r.kernel.org>, dev@...nvswitch.org,
	David Miller <davem@...emloft.net>,
	Stephen Hemminger <shemminger@...tta.com>,
	Chris Wright <chrisw@...hat.com>,
	John Fastabend <john.r.fastabend@...el.com>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: Integration of Open vSwitch

On Wed, Nov 30, 2011 at 03:00:11PM +0800, Herbert Xu wrote:
> On Tue, Nov 29, 2011 at 10:25:34PM -0800, Jesse Gross wrote:
> > Hi Herbert and Jamal (and everyone else),
> > 
> > Sorry about starting yet another thread but the other one went in so
> > many directions that I think a lot of things got lost in it.  As I
> > mentioned before, I'd like to have a bit of a design discussion of
> > what it would look like if Open vSwitch were to use some of the
> > existing components (and really focus on just that).  There were a
> > number of suggestions made about using parts of the bridge, tc,
> > netfilter, etc. and some of them overlap or conflict so I don't quite
> > have a coherent solution in mind.  Would you guys mind walking through
> > what each of you envision it looking like?
> 
> Personally I think your patches are fine as is.
> 
> It would obviously be nice if we could refactor the code as Jamal
> suggested into classifiers/actions, which would allow us to reuse
> them elsewhere, e.g., the flow cache classifier could be merged
> with the GRO mechanism, or something even grander like the unified
> flow cache, while the using standard actions would make all
> existing actions available and generalise OVS into something
> that allows you to direct traffic at will to any destination
> in a system, without having to have a data-path object at all.
> 
> But really I don't see immediate gains that are big enough to
> warrant any actions in that direction right now.  If we really
> wanted to do that in future we can always add those classifiers
> and actions and migrate things over.
> 
> The other factor I considered is scalability.  The OVS code as is
> is not really friendly to SMP/NUMA scalability (but as Eric pointed,
> neither is the classifier/action layer).  However, if this were to
> become a problem in future I'm sure we could extend either the
> interface as is (e.g., deploying multiqueue netlink sockets), or
> migrate to something else.
> 
> So I don't really have any objections to this going into the tree.

I apologies for being rather quiet in this discussion up until now,
the only reason for which being that I have been rather busy with other things.

I have now made a few comments on some other posts with regards to
scaling of flow counts and creation rates as I have done some work
in that area recently.

But as I have been involved in Open vSwitch for a while now I feel it would
remiss of me to not (finally) publicly state that I am supportive of the
current merge effort.
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