kernel-packages team mailing list archive

[Colin King <1248621@xxxxxxxxxxxxxxxxxx>]

So, the ACPI _PSS object returns the number of supported CPU frequencies
and this test sets the CPU(s) to each frequency and checks the
performance of each frequency.   The amount of compute possible "bogo
cycles" in a fixed amount of time should scale accordingly.  In this
machine's case, it has turboboost as the top frequency and all other
frequencies don't seem to scale (they are all set to 93.3% of the
maximum turboboost compute rate), which appears erroneous to fwts (and
to me too!)

Hence the test says "Frequency scaling not supported.", because it does
not appear to do so because it fails so many scaling settings.

Because the test discovered that CPU frequency scaling looks broken or
not supported it does not need to waste time to exercise the other 7
CPUs since they all will respond the same way.

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https://bugs.launchpad.net/bugs/1248621

Title:
  Medium Errors when running cpufreq test in fwts

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  While running the cpufreq test on a server, we encountered the
  following (Here's the full log)

  Results generated by fwts: Version V13.09.01 (2013-09-17 07:41:02).

  Some of this work - Copyright (c) 1999 - 2010, Intel Corp. All rights reserved.
  Some of this work - Copyright (c) 2010 - 2013, Canonical.

  This test run on 05/11/13 at 16:05:51 on host Linux ubuntuc1n1 3.11.0-12-generic
  #19-Ubuntu SMP Wed Oct 9 16:20:46 UTC 2013 x86_64.

  Command: "fwts -q --stdout-summary -r /root/.checkbox/scaling_test.log cpufreq".
  Running tests: cpufreq.

  cpufreq: CPU frequency scaling tests.
  --------------------------------------------------------------------------------
  Test 1 of 1: CPU P-State Checks.
  For each processor in the system, this test steps through the various frequency
  states (P-states) that the BIOS advertises for the processor. For each processor
  /frequency combination, a quick performance value is measured. The test then
  validates that:
    1. Each processor has the same number of frequency states.
    2. Higher advertised frequencies have a higher performance.
    3. No duplicate frequency values are reported by the BIOS.
    4. BIOS doing Sw_All P-state coordination across cores.
    5. BIOS doing Sw_Any P-state coordination across cores.

  CPU 0: 14 CPU frequency steps supported.
   Frequency | Relative Speed | Bogo loops
  -----------+----------------+-----------
    2.45 GHz |     100.0 %    |    155783
    2.45 GHz |      92.3 %    |    143795
    2.35 GHz |      92.3 %    |    143798
    2.25 GHz |      92.3 %    |    143796
    2.15 GHz |      92.3 %    |    143797
    2.05 GHz |      92.3 %    |    143794
    1.95 GHz |      92.3 %    |    143815
    1.85 GHz |      92.3 %    |    143710
    1.75 GHz |      92.3 %    |    143789
    1.65 GHz |      92.3 %    |    143795
    1500 MHz |      92.3 %    |    143798
    1400 MHz |      92.3 %    |    143799
    1300 MHz |      92.3 %    |    143796
    1200 MHz |      92.3 %    |    143797

  FAILED [MEDIUM] CPUFreqSlowerOnCPU: Test 1, Supposedly higher frequency 1300 MHz
  is slower (143796 bogo loops) than frequency 1300 MHz (143797 bogo loops) on CPU
  0.
  FAILED [MEDIUM] CPUFreqSlowerOnCPU: Test 1, Supposedly higher frequency 1500 MHz
  is slower (143798 bogo loops) than frequency 1500 MHz (143799 bogo loops) on CPU
  0.
  FAILED [MEDIUM] CPUFreqSlowerOnCPU: Test 1, Supposedly higher frequency 1.65 GHz
  is slower (143795 bogo loops) than frequency 1.65 GHz (143798 bogo loops) on CPU
  0.
  FAILED [MEDIUM] CPUFreqSlowerOnCPU: Test 1, Supposedly higher frequency 1.75 GHz
  is slower (143789 bogo loops) than frequency 1.75 GHz (143795 bogo loops) on CPU
  0.
  FAILED [MEDIUM] CPUFreqSlowerOnCPU: Test 1, Supposedly higher frequency 1.85 GHz
  is slower (143710 bogo loops) than frequency 1.85 GHz (143789 bogo loops) on CPU
  0.
  FAILED [MEDIUM] CPUFreqSlowerOnCPU: Test 1, Supposedly higher frequency 2.05 GHz
  is slower (143794 bogo loops) than frequency 2.05 GHz (143815 bogo loops) on CPU
  0.
  FAILED [MEDIUM] CPUFreqSlowerOnCPU: Test 1, Supposedly higher frequency 2.25 GHz
  is slower (143796 bogo loops) than frequency 2.25 GHz (143797 bogo loops) on CPU
  0.
  FAILED [MEDIUM] CPUFreqSlowerOnCPU: Test 1, Supposedly higher frequency 2.45 GHz
  is slower (143795 bogo loops) than frequency 2.45 GHz (143798 bogo loops) on CPU
  0.
  Frequency scaling not supported.

  ================================================================================
  0 passed, 8 failed, 0 warnings, 0 aborted, 0 skipped, 0 info only.
  ================================================================================

  
  0 passed, 8 failed, 0 warnings, 0 aborted, 0 skipped, 0 info only.

  Test Failure Summary
  ================================================================================

  Critical failures: NONE

  High failures: NONE

  Medium failures: 8
   cpufreq: Supposedly higher frequency   1300 MHz is slower (143796 bogo loops) than frequency   1300 MHz (143797 bogo loops) on CPU 0.
   cpufreq: Supposedly higher frequency   1500 MHz is slower (143798 bogo loops) than frequency   1500 MHz (143799 bogo loops) on CPU 0.
   cpufreq: Supposedly higher frequency   1.65 GHz is slower (143795 bogo loops) than frequency   1.65 GHz (143798 bogo loops) on CPU 0.
   cpufreq: Supposedly higher frequency   1.75 GHz is slower (143789 bogo loops) than frequency   1.75 GHz (143795 bogo loops) on CPU 0.
   cpufreq: Supposedly higher frequency   1.85 GHz is slower (143710 bogo loops) than frequency   1.85 GHz (143789 bogo loops) on CPU 0.
   cpufreq: Supposedly higher frequency   2.05 GHz is slower (143794 bogo loops) than frequency   2.05 GHz (143815 bogo loops) on CPU 0.
   cpufreq: Supposedly higher frequency   2.25 GHz is slower (143796 bogo loops) than frequency   2.25 GHz (143797 bogo loops) on CPU 0.
   cpufreq: Supposedly higher frequency   2.45 GHz is slower (143795 bogo loops) than frequency   2.45 GHz (143798 bogo loops) on CPU 0.

  Low failures: NONE

  Other failures: NONE

  Test           |Pass |Fail |Abort|Warn |Skip |Info |
  ---------------+-----+-----+-----+-----+-----+-----+
  cpufreq        |     |    8|     |     |     |     |
  ---------------+-----+-----+-----+-----+-----+-----+
  Total:         |    0|    8|    0|    0|    0|    0|
  ---------------+-----+-----+-----+-----+-----+-----+

  This results in a few questions...

  First, what exactly is causing the failures to trigger?
  Second, why does it say "Frequency scaling not supported." at the end the run messages? It appears that the cpu is being scaled up and down to various speeds, so that output is confusing and we need some clarification.

  Can you please take a look and give us some insite for the two
  questions above?

  Finally, is this a failure we should be concerned about?

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