rd.writable.fsimg how to change size of used RAM space?

[Athwale]

Hello,

I am building a special custom live fedora iso which uses this dracut boot option: rd.writable.fsimg=1
According to man, this option does this:

rd.writable.fsimg=1
           Enables writable filesystem support. The system will boot
           with a fully writable (but non-persistent) filesystem without
           snapshots (see notes above about available live boot
           options). You can use the rootflags option to set mount
           options for the live filesystem as well (see documentation
           about rootflags in the Standard section above). This implies
           that the whole image is copied to RAM before the boot
           continues.

               Note
               There must be enough free RAM available to hold the
               complete image.
           This method is very suitable for diskless boots.

My problem is that I only have 24GB of RAM.
The image I am building is installed via kickstart to a 16GB disk leaving me with 8GB of extra space which should be enough to run.
If I run this with 32GB of RAM it does work. But I do not have that much RAM on the target system.

When I boot the image, I get this:

Can someone please explain to me two things:
1. Is there some way that would let me change how much space can be used to extract the image to make it fit into 24GB?

2. In what units is the capacity there so I can convert it to something human readable?
I thought it would expand to the 16GB, but the number there does not make sense to me.

Thank you.

[Athwale]

I believe it may be related to this #2551

[Athwale]

Also related to #2550