Help understand nic percentage metrics

[luddite516]

Reviewing nic_common metrics, I am trying to make sense of the metrics nic_rx_percent and nic_tx_percent, which appear to be calculated by the nic plugin based on link speed and bytes received/sent.

May be best to use an example. on a 10Gbe link, I have in one case 100MB/sec bytes sent. This should calculate to about 10% utilization:
10Gbit at 10/8 link encoding as about 1GByte/sec bandwidth,
100Mb is about 10% of 1GByte.

But the nic_tx_utilization at this point is .0200. If I display that as a percent in Grafana, it displays .02%

Please advise.

[Hardikl]

So plugin would do this calculation:

1. Fetch tx_bytes and rx_bytes (in bytes)
   tx_bytes: 334657
   rx_bytes: 21411

2. Fetch link speed, which is in Mbps from ONTAP and we converted to MBps(bytes per sec) and update the speed label in nic_labels
   speed(in bytes): 125000000

3. Calculate tx_perc and rx_perc:- both are in same unit
   tx_perc: (tx_bytes/speed) 0.002677
   rx_perc: (rx_bytes/speed) 0.000017

4. set util percent from max of above
   util_perc: max(tx_perc, rx_perc) 0.002677

5. UI would show as 0.26% in the grid

For your example above, As the rx_bytes and tx_bytes values are changing too frequent, can you please share value of both of them along with speed and UI screenshot at the same time?

Also, I assume you are running on the Harvest 21.11.0 release, please confirm.