Hi, I know very well that memory on 32-bit Linux system is normally split in following way First 3GB = user space (High memory) Last 1GB = kernel space (Low memory) But I have some questions, 1. How is memory split up on 64-bit architecture 2. Can we override this 3:1 split ? 3. If yes, who can do that user or kernel? Thanks, Pritam Bankar