Very slow transfer rate between PC and VM.

[Rikumu]

This topic follows this one on the French side : Débit de transfert très lent Hoping to have more solutions.

To recap:
Data transfers between my PC and my VM and/or my SSD outside my pool are a problem.
I'm experiencing throughput drops. "At first, copying is done at around 110 MB/s for the first few seconds, but every 10 seconds, there are drops to 0 Kb/s that also last 10 seconds or even longer..."
I was able to carry out several tests:

Via iperf everything works correctly (Result in Pastebin)
I ran the tests on my two SDDs. One is running the VM, the other is in storage.
I did the test recommended by @jgreco with Solnet-Array on my two SSDs here are the results ( SSD VM - SSD Storage )

Configuration NAS :
Motherboard: B450 AORUS M
Processor: AMD Ryzen 5 5500
SSD PNY CS900 2To (Storage)
Samsung SSD 870 EVO MZ-77E500B/EU (VM)
Network card: Intel(R) 82573 (I bought a new network card because I was told that those with realtek chipsets could cause problems.
I have a 4xHDD pool on a Dell H310 SAS expansion card but no copy problems on it.

 

[Rikumu]

Little up, I've just seen on a few forums outside truenas, a lot of problems are related precisely to SSD management.
I don't know if I can post links, but on Promox and Unraid, there are similar problems.