Topic: Selintra QoS

[gippsweb]

I've been playing with Selintra's QoS panel to try and keep the phones working with downloads happening, but don't seem to be having any success.

I realise that it's only within my own network that it's going to have any effect.

We have a 8000/384k ADSL connection that will max out downloads to about 750K from the right servers and voice quality is exceptional when there are no downloads happening on the network.

When QoS in enabled the ADSL connection seems to get limited to that of a dial up connection(well not quite but it feels like it) actually it limits downloads to about 1.5-1.8M and uploads to about 40k this strangles everything passing through SME regardless of the traffic type and the settings in the QoS panel.

As soon as QoS is disabled everything runs good again, I would have though that the QoS would only slow traffic when prioritising was neccessary?

I know qos is pretty much a black art, so am not expecting miracles I was just expecting to be able to make it work a little better than it does....

[SARK devs]

I know qos is pretty much a black art, so am not expecting miracles I was just expecting to be able to make it work a little better than it does....

Hi mate,

The mileage does seem to vary for the QoS engine.  It is a pure lift of HBC Wondershaper, we don't claim anything for it other then the fact we tried three or four different QoS algorithms and, for us, this one seemed to work best.  We can fire off big uploads and downloads and still get good voice quality in the testing we've done with it.  However, we didn't attempt to look at overall throughput with it turned on/off, we merely wanted something that would give good voice quality during data stress.

If you are interested in how it works and maybe improving it, you can find the code at /home/QoS/qos - it is quite well documented (comments in the code).

Finally, what settings have you got in the QoS control panel?

How are you measuring the uplift/download speeds you mention?

Kind Regards

Selintra

[gippsweb]

Hi Jeff

I will take a look at the code, although that is definitely not my strong point.

I tried settings from 95 down to 5% without a change in quality, just a large restriction to all traffic.
I have the ADSL speeds set to 8000/384

I am just using the closest server to us on speedguide.net ..
I realise that these types of tests are not perfect, but the difference cetween QoS on and off is too big to be coincidence.

With Qos off it shows us about 6300k down and 300k up.
With QoS on it drops to about 1800k down and 40k up.
That just straight throughput with nothing else running and no calls.



I only stumbled upon this because the quality of calls has been very poor the last few weeks and after the power went out for longer than the ups's battery lasted on Friday the quality came back. for some reason QoS doesn't start automatically. So we ran a few tests to see what was happening and found this.

I will probe a bit further over the next few days if I get some time and see what else I can turn up.

[SARK devs]

Just as an aside, some of our customers have reported good results with QoS capable routers.  I don't know if the German "Billion" adsl routers are available in your locale but we've had particularly good reports from people using the "BIPAC-7100SV" with on-board QoS.

Best

J