kernel-packages team mailing list archive

[Søren Holm <sgh@xxxxxx>]

Yes - 10 CPU bound tasks fighting over the CPU would perform worse with
PREEMPT. But for a desktop tha's not an issue be cause you usually
perceive "perfomance" of the system as the systems responsivene instead
of its raw computing power.

I have no raw data. I'm just experiencing that running a lot of CPU
bound task while doing other thing feel slugish on trusty compared to
fx. to lowlatency-kernel which problably have CONFIG_PREEMPT set.

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https://bugs.launchpad.net/bugs/1271742

Title:
  CONFIG_PREEMPT is not set. Why?

Status in “linux” package in Ubuntu:
  Confirmed
Status in “linux” source package in Trusty:
  Won't Fix

Bug description:
  Since the generic kernel is for generic desktop use CONFIG_PREEMPT
  should be set. CONFIG_NO_HZ is already there so it seems strange to me
  that preempt is not especially because recommendations for desktop
  system usually includes building a preemptible kernel.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-tools-3.13.0-5-generic (not installed)
  ProcVersionSignature: Ubuntu 3.13.0-5.20-generic 3.13.0
  Uname: Linux 3.13.0-5-generic i686
  ApportVersion: 2.13.1-0ubuntu1
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  sgh        2201 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Wed Jan 22 23:12:08 2014
  InstallationDate: Installed on 2013-12-24 (29 days ago)
  InstallationMedia: Kubuntu 14.04 LTS "Trusty Tahr" - Alpha i386 (20131224)
  MachineType: LENOVO 2356GCG
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-5-generic root=UUID=6376d4d7-bb9e-4488-bb5f-798e6c41f3fc ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-5-generic N/A
   linux-backports-modules-3.13.0-5-generic  N/A
   linux-firmware                            1.122
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/02/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G7ET31WW (1.13 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 2356GCG
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrG7ET31WW(1.13):bd07/02/2012:svnLENOVO:pn2356GCG:pvrThinkPadT430s:rvnLENOVO:rn2356GCG:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2356GCG
  dmi.product.version: ThinkPad T430s
  dmi.sys.vendor: LENOVO

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