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Remember that the allocated VRAM will also be consumed by the each framebuffer (width * height * 2 byte per pixel * 2+ for swapping) as well as any other system needs.

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In general, JavaFX will try to use no more than -Dprism.targetvram=xx, freeing textures when this value is exceeded. Least used textures will be discarded, and recreated on need. The default for this setting is calculated as 75% of the  maxvram setting, equal to 45M for the example of 90M. This setting may be overly aggressive for some applications, and experimentation with a larger value and  -Dprism.poolstats=true may result in more performance.

Platform Specific Notes

i.MX6

The video memory is usually set using a kernel boot parameter. To check the kernel boot arguments, use:

 # cat /proc/cmdline 

looking for something like vmalloc=xxxM. Changing this value (or setting it if it its missing) is done by changing the u-boot script.

A different way to check for the current value is:

 # root@nitrogen6x:~# dmesg | grep vmalloc

Raspberry Pi

Video Memory allocation is covered in the Raspberry Pi page.