[Bug 198601] New: Conservative governor is broken in 4.14.14

[Bug 198601] New: Conservative governor is broken in 4.14.14

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198601

            Bug ID: 198601
           Summary: Conservative governor is broken in 4.14.14
           Product: Power Management
           Version: 2.5
    Kernel Version: 4.14.14
          Hardware: IA-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: blocking
          Priority: P1
         Component: cpufreq
          Assignee: linux-pm@vger.kernel.org
          Reporter: t.artem@mailcity.com
        Regression: No

This is happening under Intel Core i5 2500. I'm running a single instance of
the `flac` utility (which has now been running for 10 minutes already).

Under the ondemand governor:
3986.1MHz
4058.03MHz
3847.3MHz
3929.33MHz

Under the conservative governor:
1700.09MHz
1700.09MHz
1700.15MHz
1700.1MHz

For some reasons the conservative governor refuses to increase CPU cores
frequencies above 1700MHz. I'm _not_ using Intel's pstate driver:

CONFIG_ACPI=y
CONFIG_ACPI_LEGACY_TABLES_LOOKUP=y
CONFIG_ARCH_MIGHT_HAVE_ACPI_PDC=y
CONFIG_ACPI_SYSTEM_POWER_STATES_SUPPORT=y
CONFIG_ACPI_SLEEP=y
CONFIG_ACPI_PROCFS_POWER=y
CONFIG_ACPI_BUTTON=y
CONFIG_ACPI_FAN=m
CONFIG_ACPI_CPU_FREQ_PSS=y
CONFIG_ACPI_PROCESSOR_CSTATE=y
CONFIG_ACPI_PROCESSOR_IDLE=y
CONFIG_ACPI_PROCESSOR=y
CONFIG_ACPI_HOTPLUG_CPU=y
CONFIG_ACPI_PROCESSOR_AGGREGATOR=m
CONFIG_ARCH_HAS_ACPI_TABLE_UPGRADE=y
CONFIG_ACPI_PCI_SLOT=y
CONFIG_ACPI_CONTAINER=y
CONFIG_ACPI_HOTPLUG_IOAPIC=y
CONFIG_ACPI_HED=y
CONFIG_ACPI_BGRT=y
CONFIG_HAVE_ACPI_APEI=y
CONFIG_HAVE_ACPI_APEI_NMI=y
CONFIG_ACPI_APEI=y
CONFIG_ACPI_APEI_GHES=y
CONFIG_ACPI_APEI_PCIEAER=y
CONFIG_CPU_FREQ=y
CONFIG_CPU_FREQ_GOV_ATTR_SET=y
CONFIG_CPU_FREQ_GOV_COMMON=y
CONFIG_CPU_FREQ_STAT=y
CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE=y
CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
CONFIG_CPU_FREQ_GOV_POWERSAVE=y
CONFIG_CPU_FREQ_GOV_USERSPACE=y
CONFIG_CPU_FREQ_GOV_ONDEMAND=y
CONFIG_CPU_FREQ_GOV_CONSERVATIVE=y
CONFIG_X86_ACPI_CPUFREQ=y
CONFIG_PNPACPI=y
CONFIG_ATA_ACPI=y
CONFIG_ACPI_I2C_OPREGION=y
CONFIG_SENSORS_ACPI_POWER=m
CONFIG_UCSI_ACPI=m

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[Bug 198601] Conservative governor is broken in 4.14.14

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https://bugzilla.kernel.org/show_bug.cgi?id=198601

Artem S. Tashkinov (t.artem@mailcity.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Regression|No                          |Yes

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[Bug 198601] Conservative governor is broken in 4.14.14

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https://bugzilla.kernel.org/show_bug.cgi?id=198601

Zhang Rui (rui.zhang@intel.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO
                 CC|                            |rui.zhang@intel.com

--- Comment #1 from Zhang Rui (rui.zhang@intel.com) ---
does the problem still exist in 4.15?

what's the earliest kernel version that does not have this problem?
can you attach the cpu frequency with the good kernel?

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[Bug 198601] Conservative governor is broken in 4.14.14

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https://bugzilla.kernel.org/show_bug.cgi?id=198601

Viresh Kumar (viresh.kumar@linaro.org) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |viresh.kumar@linaro.org

--- Comment #2 from Viresh Kumar (viresh.kumar@linaro.org) ---
Try this commit (already in Linus's master), we solved this problem sometime
back

56026645e2b6 cpufreq: governor: Ensure sufficiently large sampling intervals

Not sure if your problem is a new one though.

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[Bug 198601] Conservative governor is broken in 4.14.14

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https://bugzilla.kernel.org/show_bug.cgi?id=198601

Artem S. Tashkinov (t.artem@mailcity.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |ASSIGNED

--- Comment #3 from Artem S. Tashkinov (t.artem@mailcity.com) ---
(In reply to Viresh Kumar from comment #2)
> Try this commit (already in Linus's master), we solved this problem sometime
> back
> 
> 56026645e2b6 cpufreq: governor: Ensure sufficiently large sampling intervals
> 
> Not sure if your problem is a new one though.

I can confirm that this patch fixes the issue.

Please submit it for 4.14.16.

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[Bug 198601] Conservative governor is broken in 4.14.14

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https://bugzilla.kernel.org/show_bug.cgi?id=198601

Artem S. Tashkinov (t.artem@mailcity.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|4.14.14                     |4.14.15

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[Bug 198601] Conservative governor is broken in 4.14

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https://bugzilla.kernel.org/show_bug.cgi?id=198601

Artem S. Tashkinov (t.artem@mailcity.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Conservative governor is    |Conservative governor is
                   |broken in 4.14.14           |broken in 4.14

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[Bug 198601] Conservative governor is broken in 4.14

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https://bugzilla.kernel.org/show_bug.cgi?id=198601

--- Comment #4 from Viresh Kumar (viresh.kumar@linaro.org) ---
Great. I have already sent it for 4.14 today.

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[Bug 198601] Conservative governor is broken in 4.14

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https://bugzilla.kernel.org/show_bug.cgi?id=198601

Artem S. Tashkinov (t.artem@mailcity.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |CODE_FIX

--- Comment #5 from Artem S. Tashkinov (t.artem@mailcity.com) ---
(In reply to Viresh Kumar from comment #4)
> Great. I have already sent it for 4.14 today.

Thank you very much! Hopefully Greg KH will include it.

I'm closing this bug report.

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