07-23-2013 12:04 PM - edited 07-23-2013 12:19 PM
- Low goodput: Radios that have an average data rate of 24 Mbps or lower.
- Low goodput: Clients that have an average data rate of 24 Mbps or lower.
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
07-23-2013 12:12 PM
The average data transfer rate in all the radio bands.
Goodput is the ratio of the total bytes transmitted or received in the network to the total air time required for transmitting or receiving the bytes. The air time includes the retransmission time taken for both successful and dropped frames.
Suppose 1000 frames of 1500 bytes each are transmitted in the network as follows:
- 50% of frames are transmitted successfully at MCS index 11 at 108 Mbps.
- 25% of the frames were dropped in the 1st attempt at 108 Mbps but were successfully transmitted using MCS index 3 at 54 Mbps in the second attempt.
- The remaining 25% are dropped in both the attempts.
Then the effective rate is calculated as: The total bits transmitted / the total air time. In this example: (500 * 1500 + 250 * 1500) * 8 / (total air time for 50% frames + total air time for 25 % frames retransmitted + total air time for 25% dropped frames) = 40.5 Mbps.
Consulting Systems Engineer - ACCX, ACDX, ACMX
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08-26-2013 03:07 PM
How many days is the radio being flagged for low goodput? If it's a single day or a week out of the whole year, then it's not too bad. But if you're seeing low goodput all the time, then that's when you'll have to consider the next steps.
1. AP load (how many clients are typically on the AP when the radio is getting low goodput)
2. ARM (is ARM trying to make changes while my radios have low goodput)
3. AP location (is AP near interferences or high latency areas)
Usually, I start by looking at a VisualRF view (if AMON is enabled, can use Health overlay), and then drill down from there.
Senior QA Engineer - Network Services
Aruba Networks, a Hewlett Packard Enterprise Company
06-03-2015 04:03 AM
On the page with the controller's dashboard, there is help menu that allows you to hover over words to understand their meaning. I am putting in the two help texts for goodput, because it explains it better than I could.
Aruba Customer Engineering
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06-07-2015 08:08 PM - edited 06-07-2015 08:11 PM
Thanks for the clarification.
I was having the impression that ratio is like SNR (Signal-to-Noise Ratio), which is a number.
However, for Goodput, I'm still trying to figure out whether Goodput (ratio?) should have Mb associated with it... (Maybe proportion/fraction would better word...)
"in the last 15 minutes" means that it is based on previous results right?