RE: Ask for help on governor

Hi,

On 2017.12.14 Stratos Karafotis wrote:

I'm not sure I understood what the problem is (maybe because I can't see
the description of the issue in the quotes).

For my part of it, the problem is that the default sample_period for
the intel_cpufreq scaling driver (i.e. intel_pstate in passive mode)
is 500 uSec. Everything, as far as I can determine, becomes busted if
the sampling period is less than a jiffy.

By the way, the default sampling period for the acpi_cpufreq driver seems to be
10 milliseconds, and everything is fine. I do not know why the defaults for
the intel_cpufreq driver are so short, and suggest that they shouldn't be,
in which case your commit might be O.K.

Commit 00bfe05889e91b5112893b001e4a47b0a0f8bdd7 affects only conservative
governor.
Do you have the same issue with ondemand too?

Yes, this entire thread has been about the conservative governor.

That was the first time Andy mentioned issues with on demand, but
I do see it misbehave with the intel_cpufreq default sample period
(a.k.a sampling_rate) of 500uSec. See another e-mail I send in a moment.

... Doug