netdev - Re: [ovs-dev] [PATCH net-next 4/4] net: Add Open vSwitch kernel components.

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Message-Id: <198A6700-6BB3-4639-A2AC-C306DFB24CE0@nicira.com>
Date:	Sat, 26 Nov 2011 23:17:50 -0800
From:	Justin Pettit <jpettit@...ira.com>
To:	jhs@...atatu.com
Cc:	Jesse Gross <jesse@...ira.com>, dev@...nvswitch.org,
	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Subject: Re: [ovs-dev] [PATCH net-next 4/4] net: Add Open vSwitch kernel components.

On Nov 24, 2011, at 5:25 AM, jamal wrote:

> The most basic IMO is to use netlink if you are doing
> it from a programmatic interface. You seem to be doing that
> already for other items (eg HTB) in the setup. There are
> a few libraries out there you could use but i realize
> that they may not match your license requirements.
> Maybe you could isolate your netlink code and make it 
> standalone based on the license you use and people who 
> need that could use it.

You're right--calling tc directly through system() is kind of ugly.  That code was written a *long* time ago when we wanted a quick QoS story.  As you mentioned, we use netlink to configure traffic shaping, so we have all the pieces at this point.  I just think no one ever bothered to clean up that little wart in userspace.  I'll put that on my to-do list.  Obviously, this doesn't affect the kernel portions.  Thanks for bringing it to our attention.

> The other thing, is you match every flow on the specific
> virtual port - this may be design intent but it appears
> very inflexible.

We encourage users to use shaping, since it generally provides better results (and we do expose per-flow granularity there).  As a result, we haven't seen a need to improve support for policing.

--Justin

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