sched_autogroup_enabled breaks niceness
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Triaged
|
Wishlist
|
Unassigned |
Bug Description
With the default Ubuntu 13.04 sysctl settings and boot parameters, positively niced tasks are very clearly given a larger share of CPU time than they ought to be. The update-
If, on the other hand, I boot with the 'noautogroup' kernel parameter (which sets kernel.
In both cases, processes are reported by top and ps as running at the correct niceness; it appears that the nice level is ignored silently.
Autogrouping is supposed to provide better responsiveness under some loads, but I believe that breaking nice settings is too high a price. I think it would be a good idea to turn off kernel.
By the way, an important note: modifying the sched_autogroup
---
ApportVersion: 2.9.2-0ubuntu8.3
Architecture: i386
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/
CurrentDmesg:
[ 23.536912] IPv6: ADDRCONF(
[ 70.086188] nr_pdflush_threads exported in /proc is scheduled for removal
[ 70.086403] sysctl: The scan_unevictabl
[ 186.829290] IPv6: ADDRCONF(
DistroRelease: Ubuntu 13.04
HibernationDevice: RESUME=
InstallationDate: Installed on 2013-09-01 (0 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release i386 (20130424)
MachineType: Acer, inc. Aspire 3680
MarkForUpload: True
Package: linux (not installed)
PccardctlIdent:
Socket 0:
no product info available
PccardctlStatus:
Socket 0:
no card
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=
ProcVersionSign
RelatedPackageV
linux-
linux-
linux-firmware 1.106
Tags: raring
Uname: Linux 3.8.0-29-generic i686
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
dmi.bios.date: 10/27/06
dmi.bios.vendor: Acer
dmi.bios.version: v1.3216
dmi.board.name: Prespa1
dmi.board.vendor: Acer, Inc.
dmi.board.version: Not Applicable
dmi.chassis.type: 1
dmi.chassis.vendor: Acer, Inc.
dmi.chassis.
dmi.modalias: dmi:bvnAcer:
dmi.product.name: Aspire 3680
dmi.product.
dmi.sys.vendor: Acer, inc.
tags: | added: bios-outdated-3508 needs-upstream-testing |
Changed in linux (Ubuntu): | |
importance: | Undecided → Medium |
tags: | added: kernel-da-key |
Changed in linux (Ubuntu): | |
importance: | Medium → Wishlist |
status: | Confirmed → Triaged |
tags: | added: kernel-key |
tags: | removed: kernel-key |
This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:
apport-collect 1219548
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.