Different maximum RAM sizes on NX depending on Jetpack version

Robotics & Edge Computing Jetson & Embedded Systems Jetson Xavier NX
1

Hello everybody,

while working with an Jetson Xavier 8GB production module on an Avermedia EN715 carrier board I noticed that the amount of total RAM that is available to the operating system differs by around 1GB when using different BSPs (as provided by the manufacturer of the carrier board).

For example:

  • JP 5.1.2. (ubuntu 20): tegrastats gives me a total ram size of 6845MB
  • JP 4.5.1. (ubuntu 18): tegratstats tells me 7765MB max

I flashed both variants with Linux_for_Tegra# ./flash.sh jetson-xavier-nx-en715 mmcblk0p1 and I used the same physical hardware for both runs.

The BSPs are available from here: EN715 - AVerMedia | AVerMedia

Is there any chance I get get my “lost” GB of RAM back when using JP5.1.2?

Im grateful for any help or pointers in the right direction!

Regards

3

Hi,
This is expected. Please check the explanation in
JP 5.0.2 missing ~1GB volatile memory - #36 by Bibek

4

Thank you for the pointer!

Regarding the questions that were left unanswered on the topic you linked: Is it right to assume that this 1GB is lost for all future updates to come and none of it can be recovered back by adjusting the space that eg optee takes up?

5

Hi,
Yes, it is expected to have less size for Jetpack 5. If you would like to have the free RAM size, please use Jetpack 4.

7

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