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Message #56173
[Bug 1310402] Status changed to Confirmed
This change was made by a bot.
** Changed in: linux (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1310402
Title:
Userland depends on ionice idle but default scheduler is "deadline".
Status in “linux” package in Ubuntu:
Confirmed
Bug description:
Userland depends upon the idle feature of the CFQ scheduler, this can
lead to extreme desktop sluggishness with the default deadline
scheduler due to IO blocking.
In my case, the KDE baloo indexer was indexing all of my files, and
making other desktop processes block. The baloo processes are set to
idle IO priority to avoid this problem but this was not being honored.
From the information I have found online and in the ionice man page,
the idle priority only is useful with the CFQ scheduler.
KDE Baloo indexer sets it's processes to use "idle" priority
the man-db cronjobs also use idle priority
root@sirius:/etc# grep idle cron.daily/man-db
iosched_idle=
iosched_idle='--iosched idle'
--oknodo --chuid man $iosched_idle -- -c \
$iosched_idle \
The compiled in default scheduler is "deadline"
root@sirius:/boot# grep DEFAULT_IOSCHED config-3.13.0-24-generic
CONFIG_DEFAULT_IOSCHED="deadline"
from the ionice man page:
Linux supports I/O scheduling priorities and classes since 2.6.13 with the CFQ I/O scheduler.
root@sirius:/boot# uname -a
Linux sirius 3.13.0-24-generic #46-Ubuntu SMP Thu Apr 10 19:11:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-generic 3.13.0.24.28
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: zmc 2658 F.... pulseaudio
zmc 3010 F.... pulseaudio
/dev/snd/controlC0: zmc 2658 F.... pulseaudio
zmc 3010 F.... pulseaudio
CurrentDesktop: KDE
Date: Sun Apr 20 17:23:28 2014
HibernationDevice: RESUME=UUID=dea47071-fda3-4725-a9c5-1f4fc531e6ef
InstallationDate: Installed on 2014-04-18 (2 days ago)
InstallationMedia: Kubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.1)
MachineType: Acer Aspire 7551
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-24-generic root=/dev/mapper/hostname-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-3.13.0-24-generic N/A
linux-backports-modules-3.13.0-24-generic N/A
linux-firmware 1.127
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/26/2010
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: V1.15
dmi.board.asset.tag: No Asset Tag
dmi.board.name: Aspire 7551
dmi.board.vendor: Acer
dmi.board.version: V1.15
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V1.15
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvrV1.15:bd10/26/2010:svnAcer:pnAspire7551:pvrV1.15:rvnAcer:rnAspire7551:rvrV1.15:cvnAcer:ct10:cvrV1.15:
dmi.product.name: Aspire 7551
dmi.product.version: V1.15
dmi.sys.vendor: Acer
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References