This link shows that the in-kenrel documentation says that for a low- latency desktop preemption is recommented.
http://www.linuxtopia.org/online_books/linux_kernel/kernel_configuration/ch09s03.html <quote> Preemption Systems running as servers have very different workload requirements from those being used as a desktop for video and audio applications. The kernel allows different modes of "preemption" in order to handle these different workloads. Preemption is the ability of the kernel to interrupt itself while it is doing something else, in order to work on something with a higher priority, such as updating a sound or video program. To change to a different preemption model, use this menu: Processor type and features Preemption Model (X) No Forced Preemption (Server) ( ) Voluntary Kernel Preemption (Desktop) ( ) Preemptible Kernel (Low-Latency Desktop) If you wish to make the kernel even more responsive to higher priority tasks than the general preemption option provides, you can also allow interruptions to one of the main internal kernel locks: Processor type and features [*] Preempt The Big Kernel Lock This option is able to be selected only if you have already selected either the Preemptible Kernel or Symmetric multi-processing support options. </quote> -- 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/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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1271742/+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
