[openib-general] question on QoS support

[Hal Rosenstock]

Makia,

On Wed, 2006-11-01 at 17:42, Makia Minich wrote:
> It just so happens that we've started looking at this here at ORNL as
> well.  I had a question about the options.  The manpage makes it seem
> that you can set these qos options (e.g. qos_high_limit) from the
> command line, but I haven't been overly successful.

What are you referring to in the man page ?

Which OpenSM are you using (trunk or 1.1 based) ?

> Is there an example of this being done?

Yes in both the man page under QOS CONFIGURATION or under
osm/doc/qos-config.txt in the repository.

>   Or is changing the /var/cache/osm/opensm.opts file
> the preferred method of changing the options?

I think it's the only way but it is imperative QoS is enabled for this
to have any effect.

-- Hal

> Sasha Khapyorsky wrote:
> > On 16:52 Wed 01 Nov     , Oliver wrote:
> >> Hi, folks -
> >>
> >> I am trying to verify and evaluate IB QoS support, running openSM as
> >> subnet manager. The perftest program is extended to set SL as command
> >> line options instead of default 0, and by modifying VL arbitration
> >> tables, I am expecting to see the traffic shaping can actually take
> >> place, but it did not.  More details on configuration:
> >>
> >> in opensm.opts:
> >> # QoS default options
> >> qos_high_limit 255 # disable low priority table
> >> qos_vlarb_high: 0:4,1:4,2:8,3:0, 4:0 .... # this is to give VL 2
> >> (corresponding to SL 2) a higher weight 8
> >> qos_sl2vl 0,1,2,3,4, ... # no changes here
> >>
> >> I think (though not verified) the Voltaire HCA we are using can
> >> support 8 data VLs. I don't have much more information to go on why
> >> qos shaping is not taking place, any suggestions?
> > 
> > You can verify actual port's parameters with smpquery (from diags), you
> > will need to run to get QoS related parameters:
> > 
> >   smpquery portinfo ...
> >   smpquery vlarb ...
> >   smpquery sl2vl ...
> > 
> > Sasha
> > 
> >> A related question is, if I modify qos setting in SM, do I need to
> >> restart SA on each hosts for it to see the changes? (I am hoping not,
> >> as I tried in the test, it doesn't seem to make a difference)
> >>
> >> Thanks for help.
> >> -- 
> >> Oliver
> >>
> >> _______________________________________________
> >> openib-general mailing list
> >> openib-general at openib.org
> >> http://openib.org/mailman/listinfo/openib-general
> >>
> >> To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
> >>
> > 
> > _______________________________________________
> > openib-general mailing list
> > openib-general at openib.org
> > http://openib.org/mailman/listinfo/openib-general
> > 
> > To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
> > 
> >