I'm using a Dell Wyse 5070 Thin Client with 32GB RAM. Due to the chipset, it can only use 30GB of RAM (up to block 0x800000000), everything above that address only runs extremely slow. Is there a way to exlude those specific blocks from Unraid?

 

For Windows 7 and above, I know that boot parameter:

bcdedit /set {current} truncatememory 0x800000000

 

For Linux, I found either mem oder memmap for Grub where memmap seems better as you can exclude specific blocks.

Does memmap work with Unraid or is there a similar boot parameter or system setting to exclude all memory above the specified block?

You can limit the total RAM used by the kernel by adding the mem option to syslinux.cfg, e.g.

 

mem=16G

 

but not sure that will limit the use to the first 16GB