---
title: "Calculating the Duration and average Data rate"
slug: "packet-tricks-calculating-the-duration-and-average-data-rate"
updated: 2024-12-20T03:51:28Z
published: 2024-12-20T03:51:28Z
canonical: "docs.fmad.io/packet-tricks-calculating-the-duration-and-average-data-rate"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.fmad.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Calculating the Duration and average Data rate

It can be helpful to understand the time duration and average datarate of a capture.

Select a captured file using FMADIO CLI `show capture list` ( [https://docs4.fmad.io/docs/fmadiocli-configure-capture#show-capture-list](https://docs4.fmad.io/docs/fmadiocli-configure-capture#show-capture-list) )

```plaintext
fmadiocli "show capture list"
```

Example output below

```plaintext

fmadio@fmadio100v2-228U:~$ fmadiocli "show capture list"
fmad fmadlua Dec 10 2024 (/opt/fmadio/bin/fmadiolua --nocal /opt/fmadio/bin/fmadiocli show capture list )
Disable cycle calibration
[Fri Dec 20 11:46:25 2024] CmdLine [show capture list]
[Fri Dec 20 11:46:25 2024] Cmd [show capture list ]
[Fri Dec 20 11:46:25 2024] [test-upload_20241218_1459                                                       ]        1,373,634,560 B (Tue . 22:17:55 . 10-12-2024)
[Fri Dec 20 11:46:25 2024] [4x10G_at64B_20241202_1756                                                       ]        4,414,504,960 B (Mon . 17:56:39 . 02-12-2024)
[Fri Dec 20 11:46:25 2024] [l1_1x25G_compress_20241128_1351                                                 ]           12,582,912 B (Thu . 13:54:25 . 28-11-2024)
[Fri Dec 20 11:46:25 2024] [test_4x25_from_start_20241128_1325                                              ]          247,463,936 B (Thu . 13:26:27 . 28-11-2024)
[Fri Dec 20 11:46:25 2024] [sg2_20241127_2000                                                               ]   10,934,500,720,640 B (Wed . 20:17:16 . 27-11-2024)
[Fri Dec 20 11:46:25 2024] [sg2_20241127_1930                                                               ]   13,237,015,281,664 B (Wed . 19:59:39 . 27-11-2024)
[Fri Dec 20 11:46:25 2024] [teleco_20241218_1922                                                            ]      110,280,835,072 B (Fri . 21:08:03 . 06-10-2023)
[Fri Dec 20 11:46:25 2024] [euronext_20241219_1638                                                          ]       81,132,519,424 B (Thu . 20:00:01 . 03-08-2023)
[Fri Dec 20 11:46:25 2024] [interop17_20241218_1917                                                         ]        5,014,290,432 B (Fri . 21:40:10 . 09-06-2017)
done 0.126824Sec 0.002114Min
fmadio@fmadio100v2-228U:~$
```

In this case we are selecting `interop17_20241218_1917` as the capture file to use

Then use the utility `capinfos2` to calculate the statistics. This may take a while depending on the size of the capture.

- <capture name> is the name of the capture to run analysis on

```plaintext
sudo stream_cat --chunked <capture name> | capinfos2 -v
```

Example output:

```plaintext
fmadio@fmadio100v2-228U:~$ sudo stream_cat --chunked interop17_20241218_1917 | capinfos2 -v
calibrating...
Chunked Packet output
stream_cat ioqueue: 4
calibrating...
0 : 2095066854           2.0951 cycles/nsec offset:4.933 Mhz
Cycles/Sec 2095066854.0000 Std:       0 cycle std(  0.00000000) Target:2.10 Ghz
0 : 2095070344           2.0951 cycles/nsec offset:4.930 Mhz
Cycles/Sec 2095070344.0000 Std:       0 cycle std(  0.00000000) Target:2.10 Ghz
StartChunkID: 43834728
StartChunk: 43834728 Offset: 0 Stride: 1
StartChunk: 43834728
FMAD Format Chunked
0.00GB    0.000 Gbps    0.000 Mpps SeqError:0
1.56GB   12.509 Gbps    1.370 Mpps SeqError:0
3.13GB   12.538 Gbps    1.367 Mpps SeqError:0
4.65GB   12.142 Gbps    1.305 Mpps SeqError:0
Chunk 43853856 StreamIndex Change: 1396 1395
no chunk. exiting
20241220_115003 4.311s : Pkt:4287993 Byte:649342360 SUCCESS
FMADHeader read fail: 0 48 : 0 Success
Total Packets: 4287993
TotalBytes     : 4931392897
TotalPackets   : 4287993
PayloadCRC     : 1ad36e19b7a03370
ErrorSeq       : 0
ErrorPktSize   : 0
LastByte       : 0x00000000
SeqStart       : 0x00000000 0x00000000 0x00000000 0x00000000 : 0x00000000
SeqEnd         : 0x00000000 0x00000000 0x00000000 0x00000000 : 0x00000000
PacketCnt      : 0 0 0 0
TimeOrder      : 0
CRCFail        : 0
CRCFailFNIC    : 0
Time First     : 20170609_213953 13:39:53.717.953.341 (1497015593.717953341)
Time Last      : 20170609_214009 13:40:09.050.025.079 (1497015609.050025079)
TotalPCAPTime  : 15332071738 ns (0.256min)
Bandwidth      : 2.573 Gbps
Packet Rate    : 0.280 Mpps
Complete
fmadio@fmadio100v2-228U:~$
```

In this case we can see the total time is 0.256min

```plaintext
TotalPCAPTime  : 15332071738 ns (0.256min)
```

Average data rate

```plaintext
Bandwidth      : 2.573 Gbps
```

Plus some other statistics that may be helpful