Bug 253119

Summary:	Loss of deep CPU throttling after upgrade from 12-STABLE to 13-STABLE
Product:	Base System	Reporter:	jakub_lach
Component:	kern	Assignee:	freebsd-bugs (Nobody) <bugs>
Status:	New ---
Severity:	Affects Only Me	Keywords:	regression
Priority:	---
Version:	13.0-STABLE
Hardware:	Any
OS:	Any

Description jakub_lach 2021-01-31 11:07:53 UTC

CPU is Core2Duo T9900 (Penryn), prior I had 100 MHz available, now it starts with 800 MHz. I have "device acpi" in kernconf, should I add acpi_throttle?

Comment 1 jakub_lach 2021-01-31 23:32:45 UTC

FWIW, C1-C3 states are still present and one could argue that deep speed throttling provided no additional benefit, (hint.acpi_throttle.0.disabled=1 argument), yet it was nice to have and I grew accustomed to it (idling CPU was 100 MHz yet scaled very responsively under load to full speed).

Comment 2 jakub_lach 2021-02-01 09:06:58 UTC

(In reply to jakub_lach from comment #1)
 dmesg -a

<...>

coretemp0: <CPU On-Die Thermal Sensors> on cpu0
est0: <Enhanced SpeedStep Frequency Control> on cpu0
p4tcc0: <CPU Frequency Thermal Control> on cpu0

<...>

Comment 3 jakub_lach 2023-08-29 21:58:28 UTC

(In reply to jakub_lach from comment #0)

FWIW, 14-STABLE changed increments and scales to dev.cpu.0.freq: 349 with P9700.