netdev - Re: [GIT PULL v2] Open vSwitch

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Date:	Wed, 30 Nov 2011 15:06:47 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Jesse Gross <jesse@...ira.com>
Cc:	jhs@...atatu.com, David Miller <davem@...emloft.net>,
	netdev@...r.kernel.org, dev@...nvswitch.org
Subject: Re: [GIT PULL v2] Open vSwitch

On Tue, Nov 29, 2011 at 10:18:02PM -0800, Jesse Gross wrote:
>
> The main part that worries me about moving to a different approach is
> the impedance mismatch that occurs from the fact that Open vSwitch is
> modeling a switch and tc is not.  As Jamal alluded to above, it's
> actually the bridge code which is more conceptually similar.  In my
> experience, combining two disparate models makes things harder over
> the long run, not easier.  It also tends to show up more in some of
> the edges like userspace/kernel compatibility.

>From what I've seen in the kernel part of OVS, the most striking
thing is that it has almost nothing to do with a switch/bridge :)

In fact, if you got rid of those data path objects, and just did
things based off the vports, I reckon it would still work and do
pretty much the same thing.

For example, if you wanted you could actually use the same mechanism
to do routing.

However, I don't think we need to distract ourselves by these
grand visions right now, as the OVS patch AFAICS is sufficiently
self-contained that it does not constrain us from future changes
like this.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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