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[Bug 1264346] Re: [Dell Latitude E6520] After suspend, machine very slow with ondemand governor

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Laurent Bonnaud <Laurent.Bonnaud@xxxxxxx>
Date: Thu, 23 Jan 2014 11:18:19 -0000
Reply-to: Bug 1264346 <1264346@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Since my initial report I updated the BIOS of this laptop:

$  sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
A19
11/14/2013

and today (after 8 days of uptime and perhaps 20 suspend/resume cycles)
the bug reappeared:

# /usr/lib/checkbox/bin/frequency_governors_test
2014-01-23 12:09:52 INFO     System Capabilites:
2014-01-23 12:09:52 INFO     -------------------------------------------------
2014-01-23 12:09:52 INFO     System has 4 cpus
2014-01-23 12:09:52 INFO     Supported CPU Frequencies: 
2014-01-23 12:09:52 INFO         2801 MHz
2014-01-23 12:09:52 INFO         2800 MHz
2014-01-23 12:09:52 INFO         2600 MHz
2014-01-23 12:09:52 INFO         2400 MHz
2014-01-23 12:09:52 INFO         2200 MHz
2014-01-23 12:09:52 INFO         2000 MHz
2014-01-23 12:09:52 INFO         1800 MHz
2014-01-23 12:09:52 INFO         1600 MHz
2014-01-23 12:09:52 INFO         1400 MHz
2014-01-23 12:09:52 INFO         1200 MHz
2014-01-23 12:09:52 INFO         1000 MHz
2014-01-23 12:09:52 INFO         800 MHz
2014-01-23 12:09:52 INFO     Supported Governors: 
2014-01-23 12:09:52 INFO         conservative
2014-01-23 12:09:52 INFO         ondemand
2014-01-23 12:09:52 INFO         userspace
2014-01-23 12:09:52 INFO         powersave
2014-01-23 12:09:52 INFO         performance
2014-01-23 12:09:52 INFO     Current governors:
2014-01-23 12:09:52 INFO         cpu0: ondemand
2014-01-23 12:09:52 INFO         cpu1: ondemand
2014-01-23 12:09:52 INFO         cpu2: ondemand
2014-01-23 12:09:52 INFO         cpu3: ondemand
2014-01-23 12:09:52 INFO     Beginning Frequency Governors Testing
2014-01-23 12:09:52 INFO     Userspace Governor Test:
2014-01-23 12:09:52 INFO     -------------------------------------------------
2014-01-23 12:09:52 INFO     Setting governor to userspace
2014-01-23 12:10:22 INFO     Setting CPU frequency to 800 MHz
2014-01-23 12:10:22 INFO     Running CPU load test...
2014-01-23 12:10:22 INFO     pid 4285's current affinity list: 0-3
2014-01-23 12:10:22 INFO     pid 4285's new affinity list: 0
2014-01-23 12:10:23 INFO     Minimum frequency load test time: 0.25
2014-01-23 12:10:23 INFO     Setting CPU frequency to 2801 MHz
2014-01-23 12:10:23 INFO     Running CPU load test...
2014-01-23 12:10:23 INFO     pid 4285's current affinity list: 0
2014-01-23 12:10:23 INFO     pid 4285's new affinity list: 0
2014-01-23 12:10:23 INFO     Maximum frequency load test time: 0.05
2014-01-23 12:10:23 INFO     Found ida flag, increasing expected speedup by 8.0%
2014-01-23 12:10:23 INFO     CPU Frequency Speed Up: 3.81
2014-01-23 12:10:23 INFO     Measured Speed Up: 5.00
2014-01-23 12:10:23 INFO     Percentage Difference 31.4%
2014-01-23 12:10:23 ERROR    Measured speedup vs expected speedup is 31.4% and is not within 10.0% margin.
2014-01-23 12:10:23 INFO     On Demand Governor Test:
2014-01-23 12:10:23 INFO     -------------------------------------------------
2014-01-23 12:10:23 INFO     Setting governor to ondemand
2014-01-23 12:10:23 INFO     Waiting 5 seconds...
2014-01-23 12:10:28 INFO     Done.
2014-01-23 12:10:28 INFO     Running CPU load test...
2014-01-23 12:10:28 INFO     pid 4285's current affinity list: 0
2014-01-23 12:10:28 INFO     pid 4285's new affinity list: 0
2014-01-23 12:10:28 INFO     On Demand load test time: 0.24
2014-01-23 12:10:28 INFO     Percentage Difference vs. maximum frequency: 380.0%
2014-01-23 12:10:28 ERROR    On demand performance vs maximum of 380.0% is not within 10.0% margin
2014-01-23 12:10:28 INFO     Waiting 5 seconds...
2014-01-23 12:10:33 INFO     Done.
2014-01-23 12:10:33 INFO     Performance Governor Test:
2014-01-23 12:10:33 INFO     -------------------------------------------------
2014-01-23 12:10:33 INFO     Setting governor to performance
2014-01-23 12:10:33 INFO     Running CPU load test...
2014-01-23 12:10:33 INFO     pid 4285's current affinity list: 0
2014-01-23 12:10:33 INFO     pid 4285's new affinity list: 0
2014-01-23 12:10:33 INFO     Performance load test time: 0.05
2014-01-23 12:10:33 INFO     Percentage Difference vs. maximum frequency: 0.0%
2014-01-23 12:10:33 INFO     Conservative Governor Test:
2014-01-23 12:10:33 INFO     -------------------------------------------------
2014-01-23 12:10:33 INFO     Setting governor to conservative
2014-01-23 12:10:33 INFO     Waiting 10 seconds...
2014-01-23 12:10:43 INFO     Done.
2014-01-23 12:10:43 INFO     Running CPU load test...
2014-01-23 12:10:43 INFO     pid 4285's current affinity list: 0
2014-01-23 12:10:43 INFO     pid 4285's new affinity list: 0
2014-01-23 12:10:44 INFO     Conservative load test time: 0.24
2014-01-23 12:10:44 INFO     Percentage Difference vs. minimum frequency: 4.0%
2014-01-23 12:10:44 INFO     Restoring original governor to ondemand


** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1264346

Title:
  [Dell Latitude E6520] After suspend, machine very slow with ondemand
  governor

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  After several suspend/resume cycles and several days of uptime, using the ondemand governor the system is very slow to answer some inputs. The text output pauses for several seconds while I am typing this text. Trying to scroll a firefox window takes several seconds. Switching tabs in firefox takes several seconds:
  cat /sys/devices/system/cpu/c*/cpufreq/scaling_governor
  ondemand
  ondemand
  ondemand
  ondemand

  WORKAROUND: Setting the governor to "performance" fixes this problem.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-15-generic 3.11.0-15.23
  ProcVersionSignature: Ubuntu 3.11.0-15.23-generic 3.11.10
  Uname: Linux 3.11.0-15-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  bonnaudl   2373 F.... pulseaudio
  Date: Thu Dec 26 18:17:23 2013
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=cf81afe7-8427-45fa-9149-c11d060a5a26
  InstallationDate: Installed on 2013-04-27 (243 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: Dell Inc. Latitude E6520
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-15-generic root=UUID=749a9901-bdd3-4b5f-b80e-69414667e058 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-15-generic N/A
   linux-backports-modules-3.11.0-15-generic  N/A
   linux-firmware                             1.116
  SourcePackage: linux
  UpgradeStatus: Upgraded to saucy on 2013-10-01 (86 days ago)
  dmi.bios.date: 02/28/2012
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A12
  dmi.board.name: 0NVF5K
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A01
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA12:bd02/28/2012:svnDellInc.:pnLatitudeE6520:pvr01:rvnDellInc.:rn0NVF5K:rvrA01:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E6520
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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References

[Bug 1264346] [NEW] machine very slow with ondemand governor
From: Laurent Bonnaud, 2013-12-26