Re: [Powertop] Regression: read_msr cpu0 0x3fe : Input/output error

Re: [Powertop] Regression: read_msr cpu0 0x3fe : Input/output error

[Eoff, Ullysses A]

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This also happens on BYT-M N2830 CPU... and likely all other BYT-M SKUs.

----
U. Artie

From: PowerTop [mailto:powertop-bounces(a)lists.01.org] On Behalf Of Eoff, Ullysses A
Sent: Wednesday, February 18, 2015 12:27 PM
To: powertop(a)lists.01.org
Subject: [Powertop] Regression: read_msr cpu0 0x3fe : Input/output error

Powertop fails with error: "read_msr cpu0 0x3fe : Input/output error" on BYT-M N3540 CPU (model 0x37).

>From the sourcecode, it appears c7 support depends on the presence of "/sys/bus/pci/devices/0000:00:13.0" for model 0x37.  Directory "/sys/bus/pci/devices/0000:00:13.0" does not exist on my system.

The commit that introduced this problem is:

commit e01a025bc37f730379edc001e7f12fa269b68fbd
Author: alexandra.yates(a)linux.intel.com<mailto:alexandra.yates(a)linux.intel.com> <alexandra.yates(a)linux.intel.com<mailto:alexandra.yates(a)linux.intel.com>>
Date:   Fri Aug 22 02:52:19 2014 -0700

    bug fix intel bdw: package c-state support


----
U. Artie


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Re: [Powertop] Regression: read_msr cpu0 0x3fe : Input/output error

[Alexandra Yates]

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> This also happens on BYT-M N2830 CPU... and likely all other BYT-M SKUs.
>
> ----
> U. Artie
>
> From: PowerTop [mailto:powertop-bounces(a)lists.01.org] On Behalf Of Eoff,
> Ullysses A
> Sent: Wednesday, February 18, 2015 12:27 PM
> To: powertop(a)lists.01.org
> Subject: [Powertop] Regression: read_msr cpu0 0x3fe : Input/output error
>
> Powertop fails with error: "read_msr cpu0 0x3fe : Input/output error" on
> BYT-M N3540 CPU (model 0x37).
>
> From the sourcecode, it appears c7 support depends on the presence of
> "/sys/bus/pci/devices/0000:00:13.0" for model 0x37.  Directory
> "/sys/bus/pci/devices/0000:00:13.0" does not exist on my system.
>
> The commit that introduced this problem is:
>
> commit e01a025bc37f730379edc001e7f12fa269b68fbd
> Author:
> alexandra.yates(a)linux.intel.com<mailto:alexandra.yates(a)linux.intel.com>
> <alexandra.yates(a)linux.intel.com<mailto:alexandra.yates(a)linux.intel.com>>
> Date:   Fri Aug 22 02:52:19 2014 -0700
>
>     bug fix intel bdw: package c-state support
>
>
> ----
> U. Artie
>
> _______________________________________________
> PowerTop mailing list
> PowerTop(a)lists.01.org
> https://lists.01.org/mailman/listinfo/powertop
>
Hi Ullysses,

Thank you for reporting the bug.  I'm investigating.

Thank you,
Alexandra.

[Powertop] Regression: read_msr cpu0 0x3fe : Input/output error

[Eoff, Ullysses A]

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Powertop fails with error: "read_msr cpu0 0x3fe : Input/output error" on BYT-M N3540 CPU (model 0x37).

>From the sourcecode, it appears c7 support depends on the presence of "/sys/bus/pci/devices/0000:00:13.0" for model 0x37.  Directory "/sys/bus/pci/devices/0000:00:13.0" does not exist on my system.

The commit that introduced this problem is:

commit e01a025bc37f730379edc001e7f12fa269b68fbd
Author: alexandra.yates(a)linux.intel.com <alexandra.yates(a)linux.intel.com>
Date:   Fri Aug 22 02:52:19 2014 -0700

    bug fix intel bdw: package c-state support


----
U. Artie


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