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I tried to run an iperf test between two windows 7 laptops with one hosting a ad-hoc network. Specifically I wanted to see whether I could see a visible difference in throughput between the built in PCI card and a USB wifi adapter.

Unfortunately under both conditions I managed to see a total speed of 2.5 Mbps only.

Is Windows throttling my UDP bandwidth in some way or is iperf 2 not compatible with Windows 7?

I tested on a windows 7 to windows 10 PC as well and saw the same issue.

A wireshark trace shows almost no retries and most of the packets appear to be using 58.5 and above n rates.

However it appeared that data was being sent in bursts

This image shows the graph of packets sent

I couldn't find any information on this. I will try using iperf 3 in the meantime and also test the performace via a standard AP and update this question.

This is a screenshot of the cmd prompt Thanks in Advance!

Update: Iperf3 showed much higher speeds. 60 Mbps or so. I'll probably need to read up on the differences between the two softwares. I don't really understand why this difference exists.

Vikram Raghu
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  • Can you include the graph and screenshot in your post? – Matt Feb 23 '16 at 21:52
  • They are linked to the question. It should appear if you click on the "the image shows the graph" and "This is a screenshot". Also I have an update to this. Iperf 3 showed much higher speeds. Proper 60 Mbps. – Vikram Raghu Feb 24 '16 at 02:28

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