Running frequency_governors_test sheds some light on this bug because it exposes this error:
ERROR On demand performance vs maximum of 380.0% is not within 10.0% margin # /usr/lib/checkbox/bin/frequency_governors_test 2013-12-26 18:15:54 INFO System Capabilites: 2013-12-26 18:15:54 INFO ------------------------------------------------- 2013-12-26 18:15:54 INFO System has 4 cpus 2013-12-26 18:15:54 INFO Supported CPU Frequencies: 2013-12-26 18:15:54 INFO 2801 MHz 2013-12-26 18:15:54 INFO 2800 MHz 2013-12-26 18:15:54 INFO 2600 MHz 2013-12-26 18:15:54 INFO 2400 MHz 2013-12-26 18:15:54 INFO 2200 MHz 2013-12-26 18:15:54 INFO 2000 MHz 2013-12-26 18:15:54 INFO 1800 MHz 2013-12-26 18:15:54 INFO 1600 MHz 2013-12-26 18:15:54 INFO 1400 MHz 2013-12-26 18:15:54 INFO 1200 MHz 2013-12-26 18:15:54 INFO 1000 MHz 2013-12-26 18:15:54 INFO 800 MHz 2013-12-26 18:15:54 INFO Supported Governors: 2013-12-26 18:15:54 INFO conservative 2013-12-26 18:15:54 INFO ondemand 2013-12-26 18:15:54 INFO userspace 2013-12-26 18:15:54 INFO powersave 2013-12-26 18:15:54 INFO performance 2013-12-26 18:15:54 INFO Current governors: 2013-12-26 18:15:54 INFO cpu0: conservative 2013-12-26 18:15:54 INFO cpu1: conservative 2013-12-26 18:15:54 INFO cpu2: conservative 2013-12-26 18:15:54 INFO cpu3: conservative 2013-12-26 18:15:54 INFO Beginning Frequency Governors Testing 2013-12-26 18:15:54 INFO Userspace Governor Test: 2013-12-26 18:15:54 INFO ------------------------------------------------- 2013-12-26 18:15:54 INFO Setting governor to userspace 2013-12-26 18:16:25 INFO Setting CPU frequency to 800 MHz 2013-12-26 18:16:25 INFO Running CPU load test... 2013-12-26 18:16:25 INFO pid 4613's current affinity list: 0-3 2013-12-26 18:16:25 INFO pid 4613's new affinity list: 0 2013-12-26 18:16:25 INFO Minimum frequency load test time: 0.23 2013-12-26 18:16:25 INFO Setting CPU frequency to 2801 MHz 2013-12-26 18:16:25 INFO Running CPU load test... 2013-12-26 18:16:25 INFO pid 4613's current affinity list: 0 2013-12-26 18:16:25 INFO pid 4613's new affinity list: 0 2013-12-26 18:16:25 INFO Maximum frequency load test time: 0.05 2013-12-26 18:16:25 INFO Found ida flag, increasing expected speedup by 8.0% 2013-12-26 18:16:25 INFO CPU Frequency Speed Up: 3.81 2013-12-26 18:16:25 INFO Measured Speed Up: 4.60 2013-12-26 18:16:25 INFO Percentage Difference 20.9% 2013-12-26 18:16:25 ERROR Measured speedup vs expected speedup is 20.9% and is not within 10.0% margin. 2013-12-26 18:16:25 INFO On Demand Governor Test: 2013-12-26 18:16:25 INFO ------------------------------------------------- 2013-12-26 18:16:25 INFO Setting governor to ondemand 2013-12-26 18:16:25 INFO Waiting 5 seconds... 2013-12-26 18:16:30 INFO Done. 2013-12-26 18:16:30 INFO Running CPU load test... 2013-12-26 18:16:30 INFO pid 4613's current affinity list: 0 2013-12-26 18:16:30 INFO pid 4613's new affinity list: 0 2013-12-26 18:16:31 INFO On Demand load test time: 0.24 2013-12-26 18:16:31 INFO Percentage Difference vs. maximum frequency: 380.0% 2013-12-26 18:16:31 ERROR On demand performance vs maximum of 380.0% is not within 10.0% margin 2013-12-26 18:16:31 INFO Waiting 5 seconds... 2013-12-26 18:16:36 INFO Done. 2013-12-26 18:16:36 INFO Performance Governor Test: 2013-12-26 18:16:36 INFO ------------------------------------------------- 2013-12-26 18:16:36 INFO Setting governor to performance 2013-12-26 18:16:36 INFO Running CPU load test... 2013-12-26 18:16:36 INFO pid 4613's current affinity list: 0 2013-12-26 18:16:36 INFO pid 4613's new affinity list: 0 2013-12-26 18:16:36 INFO Performance load test time: 0.05 2013-12-26 18:16:36 INFO Percentage Difference vs. maximum frequency: 0.0% 2013-12-26 18:16:36 INFO Conservative Governor Test: 2013-12-26 18:16:36 INFO ------------------------------------------------- 2013-12-26 18:16:36 INFO Setting governor to conservative 2013-12-26 18:16:36 INFO Waiting 10 seconds... 2013-12-26 18:16:46 INFO Done. 2013-12-26 18:16:46 INFO Running CPU load test... 2013-12-26 18:16:46 INFO pid 4613's current affinity list: 0 2013-12-26 18:16:46 INFO pid 4613's new affinity list: 0 2013-12-26 18:16:47 ERROR Could not repeat load test times within 5.0% 2013-12-26 18:16:47 ERROR No Conservative load test time available. 2013-12-26 18:16:47 ERROR Not enough timing data to calculate speed differences. 2013-12-26 18:16:47 INFO Restoring original governor to conservative -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1264346 Title: machine very slow with ondemand governor Status in “linux” package in Ubuntu: New Bug description: On my laptop with this CPU: model name : Intel(R) Core(TM) i7-2640M CPU @ 2.80GHz I am using the ondemand governor: $ cat /sys/devices/system/cpu/c*/cpufreq/scaling_governor ondemand ondemand ondemand ondemand and 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 - ... Setting the governor to "performance" fixes this problem. Note that this bug does not reveal itself immediately after boot. It takes a suspend/resume to show up. 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1264346/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
