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KernelFlavourDifferences

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Frequently Asked Questions

Contents

  1. Natty
  2. Lucid

Ubuntu provides 3 main flavours of kernels -generic, desktop and generic use, -server for the server, and -virtual as a light version of -server for virtualization. The i386 -generic-pae kernel serves as both the 32bit server kernel and a 32bit generic kernel with nx (no execute) protections which are only possible in 32bit mode when pae is enabled.

Ubuntu kernels are built from the same source code and patches and the only difference are the config options that are applied. Topic branch kernels are an exception and are not covered here.

Natty

64bit kernels

Config

-generic

-server

-virtual

CONFIG_HZ

100

100

100

CONFIG_NO_HZ

y

y

y

CONFIG_ACPI_HOTPLUG_MEMORY

m

m

CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE

y

y

CONFIG_ARCH_MEMORY_PROBE

y

y

CONFIG_DEFAULT_CFQ

y

CONFIG_DEFAULT_DEADLINE

y

y

CONFIG_DEFAULT_IOSCHED

cfq

deadline

deadline

CONFIG_INTEL_IDLE

y

y

CONFIG_MEMORY_HOTPLUG

y

y

CONFIG_MEMORY_HOTPLUG_SPARSE

y

y

CONFIG_MEMORY_HOTREMOVE

y

y

CONFIG_PREEMPT_NONE

y

y

CONFIG_PREEMPT_VOLUNTARY

y

CONFIG_SCSI_SPI_ATTRS

m

y

y

CONFIG_SCSI_SYM53C8XX_2

m

y

y

CONFIG_VIRTIO

m

y

y

CONFIG_VIRTIO_BLK

m

y

y

CONFIG_VIRTIO_NET

m

y

y

CONFIG_VIRTIO_PCI

m

y

y

CONFIG_VIRTIO_RING

m

y

y

CONFIG_XEN_BLKDEV_FRONTEND

m

m

y

CONFIG_XEN_NETDEV_FRONTEND

m

m

y

32bit kernels

Config

-generic

-generic-pae

-virtual

CONFIG_HZ

250

250

250

CONFIG_NO_HZ

y

y

y

CONFIG_ARCH_DMA_ADDR_T_64BIT

y

y

CONFIG_ARCH_PHYS_ADDR_T_64BIT

y

y

CONFIG_BATTERY_OLPC

m

CONFIG_DEBUG_RODATA

y

y

CONFIG_HIGHMEM4G

y

CONFIG_HIGHMEM64G

y

y

CONFIG_HVC_IRQ

y

y

CONFIG_HVC_XEN

y

y

CONFIG_I2O_EXT_ADAPTEC_DMA64

y

y

CONFIG_INTEL_IDLE

y

y

CONFIG_IOMMU_HELPER

y

y

CONFIG_LEDS_GPIO_OF

y

CONFIG_MMC_SDHCI_OF

m

CONFIG_MOUSE_PS2_OLPC

y

CONFIG_MTD_OF_PARTS

y

CONFIG_MTD_PHYSMAP_OF

m

CONFIG_OF

y

CONFIG_OF_ADDRESS

y

CONFIG_OF_DEVICE

y

CONFIG_OF_GPIO

y

CONFIG_OF_I2C

y

CONFIG_OF_IRQ

y

CONFIG_OF_MDIO

y

CONFIG_OF_NET

y

CONFIG_OF_PROMTREE

y

CONFIG_OF_SPI

y

CONFIG_OLPC

y

CONFIG_OLPC_OPENFIRMWARE

y

CONFIG_OLPC_OPENFIRMWARE_DT

y

CONFIG_OLPC_XO1

m

CONFIG_PCI_OLPC

y

CONFIG_PCI_XEN

y

y

CONFIG_PHYS_ADDR_T_64BIT

y

y

CONFIG_PHYSICAL_ALIGN

0x1000000

0x1000000

0x100000

CONFIG_PHYSICAL_START

0x1000000

0x1000000

0x100000

CONFIG_PROC_DEVICETREE

y

CONFIG_SCSI_SPI_ATTRS

m

y

y

CONFIG_SCSI_SYM53C8XX_2

m

y

y

CONFIG_SERIAL_GRLIB_GAISLER_APBUART

m

CONFIG_SERIAL_OF_PLATFORM

m

CONFIG_SWIOTLB

y

y

CONFIG_SWIOTLB_XEN

y

y

CONFIG_SYS_HYPERVISOR

y

y

CONFIG_VIRTIO

m

y

y

CONFIG_VIRTIO_BLK

m

y

y

CONFIG_VIRTIO_NET

m

y

y

CONFIG_VIRTIO_PCI

m

y

y

CONFIG_VIRTIO_RING

m

y

y

CONFIG_X86_PAE

y

y

CONFIG_XEN

y

y

CONFIG_XEN_BACKEND

y

y

CONFIG_XEN_BALLOON

y

y

CONFIG_XEN_BLKDEV_FRONTEND

m

y

CONFIG_XEN_COMPAT_XENFS

y

y

CONFIG_XEN_DEV_EVTCHN

m

m

CONFIG_XEN_DOM0

y

y

CONFIG_XEN_FBDEV_FRONTEND

m

m

CONFIG_XEN_GNTDEV

m

m

CONFIG_XEN_KBDDEV_FRONTEND

m

m

CONFIG_XEN_MAX_DOMAIN_MEMORY

128

128

CONFIG_XEN_NETDEV_FRONTEND

m

y

CONFIG_XEN_PCIDEV_FRONTEND

m

m

CONFIG_XEN_PLATFORM_PCI

m

m

CONFIG_XEN_PRIVILEGED_GUEST

y

y

CONFIG_XEN_PVHVM

y

y

CONFIG_XEN_SAVE_RESTORE

y

y

CONFIG_XEN_SCRUB_PAGES

y

y

CONFIG_XEN_SYS_HYPERVISOR

y

y

CONFIG_XEN_XENBUS_FRONTEND

m

y

CONFIG_XENFS

m

m

CONFIG_XO1_RFKILL

m

Lucid

In Lucid -virtual is a sub-flavour of the server kernel, this means it has the exact same config settings but is packaged with a subset of the modules that are built.

64bit kernels

Config

-generic

-server

CONFIG_HZ

100

100

100

CONFIG_NO_HZ

y

y

y

CONFIG_ACPI_HOTPLUG_MEMORY

m

CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE

y

CONFIG_ARCH_MEMORY_PROBE

y

CONFIG_DEFAULT_CFQ

y

CONFIG_DEFAULT_DEADLINE

y

CONFIG_DEFAULT_IOSCHED

cfq

deadline

CONFIG_MEMORY_HOTPLUG

y

CONFIG_MEMORY_HOTPLUG_SPARSE

y

CONFIG_MEMORY_HOTREMOVE

y

CONFIG_NR_CPUS

64

256

CONFIG_PREEMPT_NONE

y

CONFIG_PREEMPT_VOLUNTARY

y

CONFIG_SCSI_SPI_ATTRS

m

y

CONFIG_SCSI_SYM53C8XX_2

m

y

CONFIG_VIRTIO

m

y

CONFIG_VIRTIO_BLK

m

y

CONFIG_VIRTIO_NET

m

y

CONFIG_VIRTIO_PCI

m

y

CONFIG_VIRTIO_RING

m

y

32bit kernels

Config

-generic

-generic-pae

CONFIG_HZ

250

250

250

CONFIG_NO_HZ

y

y

y

CONFIG_VIRTIO m

y

CONFIG_ARCH_PHYS_ADDR_T_64BIT

y

CONFIG_HIGHMEM4G

y

CONFIG_HIGHMEM64G

y

CONFIG_HVC_IRQ

y

CONFIG_HVC_XEN

y

CONFIG_I2O_EXT_ADAPTEC_DMA64

y

CONFIG_M586

y

CONFIG_M586TSC

y

CONFIG_PHYS_ADDR_T_64BIT

y

CONFIG_SCSI_SPI_ATTRS

m

y

CONFIG_SCSI_SYM53C8XX_2

m

y

CONFIG_SYS_HYPERVISOR

y

CONFIG_VIRTIO_BLK

m

y

CONFIG_VIRTIO_NET

m

y

CONFIG_VIRTIO_PCI

m

y

CONFIG_VIRTIO_RING

m

y

CONFIG_X86_CMPXCHG64

y

CONFIG_X86_MINIMUM_CPU_FAMILY

4

5

CONFIG_X86_PAE

y

CONFIG_X86_TSC

y

CONFIG_XEN

y

CONFIG_XEN_BALLOON

y

CONFIG_XEN_BLKDEV_FRONTEND

m

CONFIG_XEN_COMPAT_XENFS

y

CONFIG_XEN_DEV_EVTCHN

m

CONFIG_XEN_FBDEV_FRONTEND

m

CONFIG_XEN_KBDDEV_FRONTEND

m

CONFIG_XEN_MAX_DOMAIN_MEMORY

32

CONFIG_XEN_NETDEV_FRONTEND

m

CONFIG_XEN_SAVE_RESTORE

y

CONFIG_XEN_SCRUB_PAGES

y

CONFIG_XEN_SYS_HYPERVISOR

y

CONFIG_XENFS

m

Kernel/FAQ/KernelFlavourDifferences (last edited 2011年05月16日 22:08:07 by static-50-53-37-130)

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