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In linux kernel, there is an option to reserve a portion of system ram i.e memmap=512M$2G (boot param) Here 512M starting from 2G would be reserved and not available to OS

What is the equivalent in freebsd ?

migrated from serverfault.com Jul 4 '13 at 19:38

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You can override hw.physmem at /boot/loader.conf to any value below actual memory size. There is no real alternative to create holes in address space on boot.

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