Re: x86 MSRs - example program

Alan Cox (
Fri, 28 Feb 1997 23:22:36 +0000 (GMT)

> article). I'm using RDTSC from user space since a while in a FFT
> benchmarking software, i just wonder how it is possible ?
> my software can be found here:
> Needless to say that i own an intel pentium.

RDTSC access from user mode is controlled by one of the other magic
control registers. See