How to calculate the throughput of the received packets in wireshark?

asked 2018-05-24 10:41:59 +0000

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How to calculate the throughput of the received packets in wireshark?

Hi I am do packet analysis of the packets received from the FPGA Ethernet module using Wireshark

Interface:

Tx-Path

FPGA (MAC) --> PHY(external) --> RJ45 connector --> PC(wireshark)

I am transmitting raw data @ 1Gbps rate from the FPGA to be captured on the wireshark, I am able to see the packets and analyse, I have captured the statistics --> summary --> Avg.Mbit/Sec = 730Mbps, against 1Gbps rate we are transmitting. Is this the correct method to check the data rate.

Regards,

Chethan

answered 2018-05-24 17:49:02 +0000

Christian_R

2059 ●9 ●71 ●51 http://crnetpackets.com

updated 2018-05-24 18:44:24 +0000

You are lucky that you were able to capture that high amount of data. Wireshark shows you the Layer2 throughput. So for example if your frames are 64Byte long, then your maximum possible Layer2 throughput will be 761 MBit/s but on Layer1 it represents 1Gbit/s.

Furthermore it is possible, that Wireshark has dropped some frames while capturing, watch out for dropped frames counter. Have you tried the same with tcpdump or windump?

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Hi Christian,

Thanks for the reply. Observation: Throughput @ 1522 octets data packet - 730Mbps Throughput @ 64 octets data packet - 710 Mbps

Though theoretically it should improve the throughput - I see 20Mbps jump only.

Layer 2 Ethernet frame has 20 octets overhead, Hence

64octets/84 octets = 761Mbps

1522/1542 = 987Mbps, whereas achieved is only 730Mbps.

Let me work on this more and update you.

Regards, Chethan

Che ( 2018-05-25 11:30:17 +0000 )edit

Btw what do you exactly mean with phy external?

Christian_R ( 2018-05-25 15:59:58 +0000 )edit

Hi Christian,

Btw what do you exactly mean with phy external?

FPGA has only the MAC in it. We have PHY external to the MAC - Phy is a separate Microchip IC mounted on the board.

Regards, Chethan

Che ( 2018-05-26 05:06:59 +0000 )edit

What seems interesting to me here is, that you are able to capture >700MBit/s with Wireshark. It is more than I have ever reached. The question is still is the capture setup the limit or is your Device under test the limiter.

So easiest way to find out, would be from my point of to use proffessional capture equipment.

https://blog.packet-foo.com/2016/11/t...

Christian_R ( 2018-05-26 10:58:19 +0000 )edit

Hi Christian,

So >700Mbps is a good throughput to be captured in wireshark. Can you suggest us some professional equipment to capture the packets.

Regards, Chethan

Che ( 2018-05-30 06:12:29 +0000 )edit

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