Intel SpeedShift

[Mineralwasser]

Hi,

Don't get confused:
SpeedShift is not the same as SpeedStep.

I'm currently going through all options of my new mainboard.
One option is "Intel Speed Shift" and it is disabled by default.

I've found this very good article about it.
It sounds like this feature is very positive and doesn't have any downsides?
Why is it then disabled by default? (Maybe because of the following...?)

However, it is also said that the OS needs to support this feature too.
I guess this is a kernel thing and not really related to Proxmox?

According to this post it should be supported since kernel 4.10?
I'm not sure which kernel Proxmox currently uses but I guess the Debian Buster default?
So this would be 4.19.

So I guess I will enable it?
Why is it disabled by default?
Does anyone have experiences with this feature?
Any recommendations?

Thank you

 

[t.lamprecht]

Hi,

I'm not sure which kernel Proxmox currently uses but I guess the Debian Buster default?
So this would be 4.19.

No, we don't use Buster's default as uname -a or a look into the kernel git repo or our release notes show
Proxmox VE 5 (based on Stretch) had already the 4.15 kernel available.

So I guess I will enable it?
Why is it disabled by default?
Does anyone have experiences with this feature?
Any recommendations?

Not all guest OS can cope with frequency shifting from the host CPU that well, especially some older Windows versions had issues with this. But nowadays it could have gotten better, why don't you just try it out and report back

 

[Mineralwasser]

Couldn't look at the kernel version by myself since I didn't install Proxmox on that machine yet.
And this will be my first Proxmox installation (beside some tests in a vm) anyway.

Yeah I've turned it on... let's see how it works.