Incorrect processing of the test pattern

[MysticFoxDE]

Hi Friends,

over the last few days, I have been running some very intensive test series with Server 2019 and also 2025 to determine/compare their behaviour with a specific workload.

During the tests, for example, I also wanted to see how the systems behave with a network load with a block size of 4K with only one worker and one oIO.

I used the following test pattern for this.

NTttcp Sender:
NTttcp.exe -s -m 1,22,192.168.10.2 -l 4K -a 1 -t 60 -nic 192.168.10.1 -v

#NTttcp Receiver:
NTttcp.exe -r -m 1,22,192.168.10.2 -v -t 60

And I actually expected that NTttcp generate the data traffic following the conditions mentioned above, so that it looks like the following one ...

... but when I eavesdropped on one of the test runs on the transmitter side with Wireshark, I had to see the following ...

... in words, anything other than 4K with just one worker and one open IO. 😔

Why does NTttcp not adhere to the test specification in this case?

Best Regards from Germany

Alex