[Kernel-packages] [Bug 1058854] Re: High CPU usage of CFS
I no longer have access to this hardware to get the full computer model,
but the referenced test programs should be able to reproduce the issue
on most, if not all machines (it's worked on everyone I've tried it on
to date).
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https://bugs.launchpad.net/bugs/1058854
Title:
High CPU usage of CFS
Status in “linux” package in Ubuntu:
Incomplete
Bug description:
It appears that there is an issue with the Completely Fair Scheduler (CFS)
not intereacting well with sleep commands. I have written up a test program to
help demonstrate the issue and it can be found at:
www.github.com/daveisfera/test_sleep/
The test outputs wall time (CPU clock), user time, and system time, but
usually only the wall time and user time outputs are meaningful because the
system time is so small and usually within the standard deviation for all tests.
I have also attached the results from running this test on an HP
Pavilion dm4 and I believe that the gap at the low number of threads
is caused by either the processor going into a power saving state
because of the sleeping and/or a poor interaction with HyperThreading
(scheduling the 2 threads on logical cores rather than separate
physical cores).
Because of this, I then ran 4 instances of:
schedtool -a CPU# -e nice -19 yes /dev/null
so that all of the cores would be kept busy during the sleeping and this had
an unexpected effect of causing the wall time to increase significantly. I am
not sure what the cause of the wall time increase is, but it does help the user
time plot display the gap between the sleep methods and the none sleep methods
that I believe is a symptom/display of the unexpectedly high CPU usage when the
process should be sleeping.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-31-generic 3.2.0-31.50
ProcVersionSignature: Ubuntu 3.2.0-31.50-generic 3.2.28
Uname: Linux 3.2.0-31-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu13
Architecture: amd64
ArecordDevices:
List of CAPTURE Hardware Devices
card 0: PCH [HDA Intel PCH], device 0: STAC92xx Analog [STAC92xx Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USERPID ACCESS COMMAND
/dev/snd/controlC0: dlj1778 F pulseaudio
Card0.Amixer.info:
Card hw:0 'PCH'/'HDA Intel PCH at 0xc080 irq 50'
Mixer name : 'Intel CougarPoint HDMI'
Components : 'HDA:111d76e0,103c1793,00100102
HDA:80862805,103c1793,0010'
Controls : 22
Simple ctrls : 10
Date: Fri Sep 28 20:57:35 2012
InstallationMedia: Ubuntu 12.04.1 LTS Precise Pangolin - Release amd64
(20120823.1)
MachineType: Hewlett-Packard HP Pavilion dm4 Notebook PC
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-31-generic
root=UUID=162256F02256D479 loop=/hostname/disks/root.disk ro quiet splash
vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.2.0-31-generic N/A
linux-backports-modules-3.2.0-31-generic N/A
linux-firmware1.79.1
SourcePackage: linux
StagingDrivers: rts_pstor mei
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/17/2012
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.08
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 1793
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 41.1C
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.modalias:
dmi:bvnHewlett-Packard:bvrF.08:bd01/17/2012:svnHewlett-Packard:pnHPPaviliondm4NotebookPC:pvr068E1220471622100:rvnHewlett-Packard:rn1793:rvr41.1C:cvnHewlett-Packard:ct10:cvrChassisVersion:
dmi.product.name: HP Pavilion dm4 Notebook PC
dmi.product.version: 068E1220471622100
dmi.sys.vendor: Hewlett-Packard
To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1058854] Re: High CPU usage of CFS
** Changed in: linux (Ubuntu)
Importance: Medium = Low
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
--
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/1058854
Title:
High CPU usage of CFS
Status in “linux” package in Ubuntu:
Confirmed
Bug description:
It appears that there is an issue with the Completely Fair Scheduler (CFS)
not intereacting well with sleep commands. I have written up a test program to
help demonstrate the issue and it can be found at:
www.github.com/daveisfera/test_sleep/
The test outputs wall time (CPU clock), user time, and system time, but
usually only the wall time and user time outputs are meaningful because the
system time is so small and usually within the standard deviation for all tests.
I have also attached the results from running this test on an HP
Pavilion dm4 and I believe that the gap at the low number of threads
is caused by either the processor going into a power saving state
because of the sleeping and/or a poor interaction with HyperThreading
(scheduling the 2 threads on logical cores rather than separate
physical cores).
Because of this, I then ran 4 instances of:
schedtool -a CPU# -e nice -19 yes /dev/null
so that all of the cores would be kept busy during the sleeping and this had
an unexpected effect of causing the wall time to increase significantly. I am
not sure what the cause of the wall time increase is, but it does help the user
time plot display the gap between the sleep methods and the none sleep methods
that I believe is a symptom/display of the unexpectedly high CPU usage when the
process should be sleeping.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-31-generic 3.2.0-31.50
ProcVersionSignature: Ubuntu 3.2.0-31.50-generic 3.2.28
Uname: Linux 3.2.0-31-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu13
Architecture: amd64
ArecordDevices:
List of CAPTURE Hardware Devices
card 0: PCH [HDA Intel PCH], device 0: STAC92xx Analog [STAC92xx Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USERPID ACCESS COMMAND
/dev/snd/controlC0: dlj1778 F pulseaudio
Card0.Amixer.info:
Card hw:0 'PCH'/'HDA Intel PCH at 0xc080 irq 50'
Mixer name : 'Intel CougarPoint HDMI'
Components : 'HDA:111d76e0,103c1793,00100102
HDA:80862805,103c1793,0010'
Controls : 22
Simple ctrls : 10
Date: Fri Sep 28 20:57:35 2012
InstallationMedia: Ubuntu 12.04.1 LTS Precise Pangolin - Release amd64
(20120823.1)
MachineType: Hewlett-Packard HP Pavilion dm4 Notebook PC
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-31-generic
root=UUID=162256F02256D479 loop=/hostname/disks/root.disk ro quiet splash
vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.2.0-31-generic N/A
linux-backports-modules-3.2.0-31-generic N/A
linux-firmware1.79.1
SourcePackage: linux
StagingDrivers: rts_pstor mei
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/17/2012
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.08
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 1793
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 41.1C
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.modalias:
dmi:bvnHewlett-Packard:bvrF.08:bd01/17/2012:svnHewlett-Packard:pnHPPaviliondm4NotebookPC:pvr068E1220471622100:rvnHewlett-Packard:rn1793:rvr41.1C:cvnHewlett-Packard:ct10:cvrChassisVersion:
dmi.product.name: HP Pavilion dm4 Notebook PC
dmi.product.version: 068E1220471622100
dmi.sys.vendor: Hewlett-Packard
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1058854/+subscriptions
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More help : https://help.launchpad.net/ListHelp
[Kernel-packages] [Bug 1058854] Re: High CPU usage of CFS
Dave Johansen, could you please provide the full computer model as noted
on the sticker (ex. HP Pavilion dm4-2015dx Entertainment Notebook PC)?
** Changed in: linux (Ubuntu)
Status: Confirmed = Incomplete
** Tags added: needs-full-computer-model
--
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/1058854
Title:
High CPU usage of CFS
Status in “linux” package in Ubuntu:
Incomplete
Bug description:
It appears that there is an issue with the Completely Fair Scheduler (CFS)
not intereacting well with sleep commands. I have written up a test program to
help demonstrate the issue and it can be found at:
www.github.com/daveisfera/test_sleep/
The test outputs wall time (CPU clock), user time, and system time, but
usually only the wall time and user time outputs are meaningful because the
system time is so small and usually within the standard deviation for all tests.
I have also attached the results from running this test on an HP
Pavilion dm4 and I believe that the gap at the low number of threads
is caused by either the processor going into a power saving state
because of the sleeping and/or a poor interaction with HyperThreading
(scheduling the 2 threads on logical cores rather than separate
physical cores).
Because of this, I then ran 4 instances of:
schedtool -a CPU# -e nice -19 yes /dev/null
so that all of the cores would be kept busy during the sleeping and this had
an unexpected effect of causing the wall time to increase significantly. I am
not sure what the cause of the wall time increase is, but it does help the user
time plot display the gap between the sleep methods and the none sleep methods
that I believe is a symptom/display of the unexpectedly high CPU usage when the
process should be sleeping.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-31-generic 3.2.0-31.50
ProcVersionSignature: Ubuntu 3.2.0-31.50-generic 3.2.28
Uname: Linux 3.2.0-31-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu13
Architecture: amd64
ArecordDevices:
List of CAPTURE Hardware Devices
card 0: PCH [HDA Intel PCH], device 0: STAC92xx Analog [STAC92xx Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
AudioDevicesInUse:
USERPID ACCESS COMMAND
/dev/snd/controlC0: dlj1778 F pulseaudio
Card0.Amixer.info:
Card hw:0 'PCH'/'HDA Intel PCH at 0xc080 irq 50'
Mixer name : 'Intel CougarPoint HDMI'
Components : 'HDA:111d76e0,103c1793,00100102
HDA:80862805,103c1793,0010'
Controls : 22
Simple ctrls : 10
Date: Fri Sep 28 20:57:35 2012
InstallationMedia: Ubuntu 12.04.1 LTS Precise Pangolin - Release amd64
(20120823.1)
MachineType: Hewlett-Packard HP Pavilion dm4 Notebook PC
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-31-generic
root=UUID=162256F02256D479 loop=/hostname/disks/root.disk ro quiet splash
vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.2.0-31-generic N/A
linux-backports-modules-3.2.0-31-generic N/A
linux-firmware1.79.1
SourcePackage: linux
StagingDrivers: rts_pstor mei
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/17/2012
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.08
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 1793
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 41.1C
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.modalias:
dmi:bvnHewlett-Packard:bvrF.08:bd01/17/2012:svnHewlett-Packard:pnHPPaviliondm4NotebookPC:pvr068E1220471622100:rvnHewlett-Packard:rn1793:rvr41.1C:cvnHewlett-Packard:ct10:cvrChassisVersion:
dmi.product.name: HP Pavilion dm4 Notebook PC
dmi.product.version: 068E1220471622100
dmi.sys.vendor: Hewlett-Packard
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1058854/+subscriptions
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Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
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