wrmsr(1) tool for writing CPU machine specific registers (MSR)


wrmsr [options] regno value


wrmsr is a tool used for writing values to a CPU's machine specific registers (MSR).
Note: if you're running a Debian kernel, be sure that the msr.ko kernel module is loaded. 'modprobe msr' should do the trick. Otherwise, you'll get an error about wrmsr not being able to open files in /dev/cpu/...


--help, -h
Print a list of available options
--version, -V
Print current version
--all, -a
All processors
--processor <#>, -p
Select processor number (default: 0)


wrmsr was written by Transmeta Corporation

This man page was contributed by Andres Salomon <[email protected]> for the Debian GNU/Linux system (but may be used by others).