[ovs-discuss] ovs-vsctl looping

[jinho hwang]

On Thu, Jun 13, 2013 at 1:26 PM, Ben Pfaff <blp at nicira.com> wrote:

> On Thu, Jun 13, 2013 at 01:17:39PM -0400, jinho hwang wrote:
> > On Thu, Jun 13, 2013 at 12:16 PM, Ben Pfaff <blp at nicira.com> wrote:
> >
> > > On Thu, Jun 13, 2013 at 10:37:49AM -0400, jinho hwang wrote:
> > > > I am new to ovs. I am trying to set up userspace switch using
> > > > INSTALL.userspace. There are many commands to add bridge and
> interfaces
> > > > using ovs-vsctl, but ovs-vsctl does not return (infinite loop). How
> do I
> > > > have to run these commands? Just ctrl-c is ok? I may not have a good
> > > > understanding of the system yet. If you can refer me to any good
> > > > documentation related to this, it would be appreciated as well.
> > >
> > > Is ovs-vswitchd running?
> > >
> >
> > Thanks, Ben.
> >
> > I have figured out how the system works now. I thought ovs-vsctl does not
> > return to the user, but it was controlled by ovs-vswtichd that signals to
> > close. Like you said, my fault was that I did not run ovs-vswitchd
> > properly.
> >
> > A couple of more questions if you can provide some more information:
> >
> > 1. Logging:
> > ovs-aptctl shows all INFO in file column, but I can not find any file
> > logging messages. Not in /var/log and in /usr/local/var/log/
> > Is there any global knob I should control?
>
> Use --log-file, see the manpage for details.
>
> > 2. Userspace datapath:
> > - Does this mean netdev is used by datapath?
>
> Yes.
>
> > - If so, how can I query stat information of datapath? Is there even one
> to
> > query? I want to see something like "ovs-dpctl show br0", if there is
> one.
>
> You can use "ovs-appctl dpif/show".
>
> > - What are the limitations if I use userspace datapath? I know
> performance
> > can not be good, and some functionalities (tunneling) may not work.
> Right?
>
> Yes.
>

Thanks again, Ben.

Sorry to bother you, but I have follow-up questions:

1. Can you interpret these messages?
2013-06-13T17:52:20Z|00144|*dpif_netdev*|ERR|error receiving data from em1:
Message too long
2013-06-13T17:52:27Z|00145|netdev|INFO|Dropped 1214 log messages in last 12
seconds (most recently, 0 seconds ago) due to excessive rate
2013-06-13T17:52:27Z|00146|netdev|INFO|--------trace:
lib/netdev.c-netdev_recv(419)

- Why is dpif_netdev called?

- Is it a part of userspace netdev?

2. I am not very clear on where I receive packets and route them where? I
am trying to read code now, but I am not very sure.

- Can you pin point where netdev receives packets and forward them to
where?

- Also, Do flows in the table not call upcall? Or all the traffic go to the
ovs-switchd?

Thank you,

Jinho
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