My orin nano has lost 0.8GB of RAM memory

I just started up and entered the jtop command on the terminal to check the information. I found that the total memory of my Jetson Orin Nano (4G) board has changed to 3.2GB. What is the situation and is there any way to recover it?

Some memory are preserved by the system for other usage. This happened to every Jetson Orin platform. Not only Orin Nano.

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I will add (and I don’t know if this applies to this case) that some tools display 1K as 1000 bytes, and 1M as 1000*1000 bytes, and 1G as 1000*1000*1000 bytes. In other places this would instead be:

  • 1K as 1024 bytes
  • 1M as 1024*1024 bytes
  • 1G as 1024*1024*1024 bytes

This latter base 2 approach makes the number seem like they are shrinking when in reality it is just a unit conversion. Plus of course what @WayneWWW just mentioned, there are reserved memory regions, and it doesn’t mean they are gone, it just means they are reserved somewhere not available to the region being measured.

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I understand, thank you for your help!

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