The Linux 7.4 kernel's early boot-time physical memory allocator significantly reduces boot time from 268 seconds to 50 milliseconds.

Linux's Early Boot-Time Physical Memory Allocator Sees Big Speed-Up: ~268s To ~50ms Sent out today for the Linux 7.4 kernel were a set of memblock improvements. Most notable is a performance optimization within mm/memblock.c that implements the kernel's early boot-time physical memory allocator that is used prior to the bring-up of the full page allocator... https://www.phoronix.com/news/Linux-7.4-memblock

Linux's Early Boot-Time Physical Memory Allocator Sees Big Speed-Up: ~268s To ~50ms https://www.phoronix.com/news/Linux-7.4-memblock