On 13/07/2021 22:41, RVP wrote:
When the processor is operating below these limits and the user's
workload demands additional performance, the processor frequency will
dynamically increase until the upper limit of frequency is reached.
But boost only scales up from the top clock speed to above the top speed
it cant scale down or at least it can't on older generations of
processor. To scale down for increased power saving on these older
system you need a software clock control.
Later Intel CPUs gained the ability to do automatic clock scaling across
the entire frequency range but I've never looked into how it has to be
controlled. The only CPUs I've got that do it run Windows.
They keyword is Speed Shift as opposed to turbo boost. Only that can
auto clock down/power down the core. Not sure if AMD have an equivalent
but I'd be surprised if they dont.
I wasn't aware NetBSD had support for that.
Mike
