Download QoS loosing 13% (?)

[Dev_BR]

Hi,

Test 1
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QoS disabled - > 15Mbps download (this is the contract value)

Test 2
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One QoS class enabled and set to 100%
Total Download Bandwidth set to 15 Mbps
Real download: 12.8Mbps ( 12.8 / 15 = 85.3% )


Test 3
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One QoS class enabled and set to 100%
Total Download Bandwidth set to 10 Mbps
Real download: 8.87Mbps ( 8,87/10 = 88,7%)

Test 4
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One QoS class enabled and set to 100%
Total Download Bandwidth set to 6 Mbps
Real download: Mbps 5.3Mbps (5.3/6 = 88.3%)

What can be done?

Test 5 - attempt to offset the gap
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100 - 87 = 13% (discrepancy)
15Mbps * 1.13 = 16.95 Mbps

One QoS class enabled and set to 100%
Total Download Bandwidth set to 16.95 Mbps
Real download: Mbps Mbps 14.6 Mbps( 14.6/15=97,3%)

Usin Networx software
Any comments?

[pbix]

1) Exactly how are you measuring your download speeds?
2) What type of WAN connection do you have?
3) Are you using the ACC during any of the above?
4) What version of Gargoyle are you running.

[Dev_BR]

1) Exactly how are you measuring your download speeds?
2) What type of WAN connection do you have?
3) Are you using the ACC during any of the above?
4) What version of Gargoyle are you running.

1) Networx have a tool, Speed Meter
My ISP have a dedicated site for speed test.
When I click "Start" on site, I look for Load activity in router, download QoS Service Class, so I manually start the measurement.

The site has a graph of percentage of the test progress. When its approaching 100% I Finalize measurement.
The program returns, min, average and maximum. The values ​​reported are averages.

2)PPPoE / DSL 15M/1Mbps, Down/UP

3)Sorry, I dont know ACC

4) Gargoyle Version:1.5.2 , TL-MR3420

And, there is something curious. In the original firmware, same happens. I had to set UP/Download link values ​above its real, to reach 100% link capacity.

I think TCP congestion avoidance control can cause a loss, but that much?

[pbix]

ACC is "Active Congestion Control".

Beginning with v1.5.2 Gargoyle now properly accounts for ATM overhead. This subject is rather complex but you can read some details at
http://www.linuxforum.dk/2006/slides/AD ... um2006.pdf.

For maximum performance using PPPoE interface you should know the actual line speed of your DSL modem. Many modems have a web page you can access to learn what your actual line speed is. The line speed is shown in bits per seconds (kbps). I recommend to enter a number a little lower than this in the QoS page. Maybe 98% of your actual line speed. Or you can guess your actual line speed which in your case may be around 17Mbps.

The QoS class bandwidth shown on the QoS page includes ATM overhead so this number will always be slightly higher than what you will see on your Speed Meter or on the Gargoyle Bandwidth graph page. 10%-30% higher is typical but it depends on your traffic type.

Above you say 15Mbps is your "contract value" but remember this is only the maximum value. Your actual speed will vary throughout the day depending on your ISP loading. So I recommend you enable the ACC which will track your actual speed continuously and keep your QoS working properly.

[Dev_BR]

Hi Pbix,

thaks for prompt reply.

The modem is set to (Up/Down) [kbps/kbps]:1279 / 17661

I will setup router for about 1100 / 17000 and see what happens.

and try ACC too.