What is the significance of "FB memory usage" and "BAR1 memory usage" displayed by nvidia-smi command?

Solution Verified - Updated -

Issue

  • What is the significance of "FB memory usage" and "BAR1 memory usage" displayed by nvidia-smi command?
$ nvidia-smi -q -d=memory

==============NVSMI LOG==============

Timestamp                                 : Tue Mar  4 08:28:05 2025
Driver Version                            : 550.127.05
CUDA Version                              : 12.4

Attached GPUs                             : 1
GPU 00000000:31:00.0
    FB Memory Usage
        Total                             : 23034 MiB
        Reserved                          : 556 MiB
        Used                              : 1 MiB
        Free                              : 22479 MiB
    BAR1 Memory Usage
        Total                             : 32768 MiB
        Used                              : 1 MiB
        Free                              : 32767 MiB
    Conf Compute Protected Memory Usage
        Total                             : 0 MiB
        Used                              : 0 MiB
        Free                              : 0 MiB

Environment

  • Red Hat Enterprise Linux AI.

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