[ovs-discuss] OVS queues and precedence

[Łukasz Rząsik]

I've been testing different qdiscs and noticed sfq had no docs about
supported parameters.
I've just sent a patch with the docs. Hope it's useful.

2017-11-13 20:27 GMT+01:00 Ben Pfaff <blp at ovn.org>:

> On Mon, Nov 13, 2017 at 08:13:57PM +0100, Łukasz Rząsik wrote:
> > 2017-10-25 0:05 GMT+02:00 Ben Pfaff <blp at ovn.org>:
> >
> > > On Wed, Oct 18, 2017 at 09:17:53AM +0200, Jannis Ohms wrote:
> > > > Hi
> > > >
> > > >
> > > > I used the following command to create 4 queues
> > > >
> > > > ovs-vsctl -- set port s7-eth2 qos=@newqos -- --id=@newqos create qos
> > > > type=linux-htb other-config:max-rate=10000000 queues:1=@newQ
> > > queues:2=@newQ2
> > > > queues:3=@newQ3 -- --id=@newQ create queue
> other-config:min-rate=2000000
> > > > other-config:max-rate=2000000,2=@newQ2 -- --id=@newQ2 create queue
> > > > other-config:min-rate=2000000 other-config:max-rate=5000000,3=@newQ3
> --
> > > > --id=@newQ3 create queue other-config:min-rate=2000000
> > > > other-config:max-rate=6000000
> > > >
> > > > Now I wanted to know which queues precede each other i.e. if every
> queue
> > > has
> > > > a token and a packet to send who comes first. I requier this
> knowledge to
> > > > address the latency aspect of my QoS.
> > > >
> > > > I looked into Linux tc-htb manpage (https://linux.die.net/man/8/
> tc-htb)
> > > >
> > > > They define a prio property which seems to define  the precedence
> between
> > > > the queues.
> > > >
> > > > Can I pass this as an aditional parameter via ovs-vsctl
> > >
> > > OVS doesn't currently support the prio (priority) setting, and
> currently
> > > sets all priorities to 0.  If you want to submit a patch to add support
> > > for this feature, I think it would be a reasonable addition.
> > > _______________________________________________
> > > discuss mailing list
> > > discuss at openvswitch.org
> > > https://mail.openvswitch.org/mailman/listinfo/ovs-discuss
> > >
> >
> > Hi Ben, Jannis,
> >
> > I was about to implement prio (priority) setting for htb but I realized
> it
> > is actually implemented.
> > At least when I set other-config:priority for a given port then I can see
> > it set correctly with tc class show.
> >
> > Am I right or am I missing something? Maybe you meant something else?
>
> Oh, that's funny.  You're right, and it's even documented.  I checked
> the source before I replied, but I must have been looking at some other
> QoS discipline.
>
> Jannis, what's wrong with what's there?
>
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