Checking memory used by the RTAS

In addition to kdump, the Run-Time Abstraction Service (RTAS) uses memory resources during boot and can affect the amount of real memory available to your logical partition.

To see how much memory is used by the RTAS, run the following command:

od –x /proc/device-tree/rtas/rtas-size

The rtas-size value is expressed in hexadecimal. For example, the return from the previous command might look like the following:

0000000 011f 0000
0000004

To convert hexadecimal to bytes, run the following command:

echo "ibase=16; 11F0000"|bc
18808832

In this example, RTAS is using 18 808 832 bytes of memory.