Re: CPU frequency shifting "problems"

Alan Cox
2001-09-28T00:50:56Z

> For example, the Intel "SpeedStep" CPU's are completely broken under
> Linux, and real-time will advance at different speeds in DC and AC modes,
> because Intel actually changes the frequency of the TSC _and_ they don't
> document how to figure out that it changed.

The change is APM or ACPI initiated. Intel won't tell anyone anything
useful but Microsoft have published some of the required intel confidential
information which helps a bit