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"port show throughput" command incorrect on first invocation

Question asked by nevarcds on Jun 4, 2018
Latest reply on Jun 6, 2018 by jnorman

I have noticed that the command "port show throughput" returns erroneous results on the first invocation under SAOS 6.16 on a 3932 and 5160.

 

In the example below I have a test set dumping a constant 10mbps into the system. If I let the box sit for a while (not sure how long) and then issue the command I see bogus throughput numbers for ports that are up but that I know are not forwarding traffic.

 

If I immediately reissue the throughput command I see numbers that are believable and these numbers stay consistent for tens of minutes and maybe longer.

 

If this a known issue? Did I set something up incorrectly?

 

3932-TWO> port show throughput
+----------------- PORT THROUGHPUT SUMMARY    5 SECOND SAMPLE -----------------+
|   Port   |         Bit Rate (Mbps)         |         Pkt Rate (Mpps)         |
|          | Tx             | Rx             | Tx             | Rx             |
+----------+----------------+----------------+----------------+----------------+
| 1        |          6.976 |          7.028 |          0.003 |          0.003 |
| 2        |          8.788 |          8.272 |          0.016 |          0.016 |
| 3        |          8.273 |          8.273 |          0.016 |          0.016 |
| 4        |                |                |                |                |
| 5        |                |                |                |                |
| 6        |                |                |                |                |
| 7        |                |                |                |                |
| 8        |                |                |                |                |
| 9        |          0.001 |          0.001 |          0.000 |          0.000 |
| 10       |          7.137 |          7.083 |          0.003 |          0.003 |
+----------+----------------+----------------+----------------+----------------+
!!!!!! Immediately after first command, reissue command and see correct numbers:
3932-TWO> port show throughput
+----------------- PORT THROUGHPUT SUMMARY    5 SECOND SAMPLE -----------------+
|   Port   |         Bit Rate (Mbps)         |         Pkt Rate (Mpps)         |
|          | Tx             | Rx             | Tx             | Rx             |
+----------+----------------+----------------+----------------+----------------+
| 1        |                |                |                |                |
| 2        |         10.628 |         10.003 |          0.020 |          0.020 |
| 3        |         10.003 |         10.003 |          0.020 |          0.020 |
| 4        |                |                |                |                |
| 5        |                |                |                |                |
| 6        |                |                |                |                |
| 7        |                |                |                |                |
| 8        |                |                |                |                |
| 9        |          0.000 |          0.000 |          0.000 |          0.000 |
| 10       |          0.000 |          0.000 |          0.000 |          0.000 |
+----------+----------------+----------------+----------------+----------------+

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