From Fedora Project Wiki
m (1 revision(s)) |
(Cleanup from import) |
||
| Line 1: | Line 1: | ||
==Linux Kernel== | |||
==Linux Kernel== | |||
This section covers changes and important information regarding the {{Template:DocsDict/KernelVer}} | This section covers changes and important information regarding the {{Template:DocsDict/KernelVer}} based kernel in Fedora {{Template:DocsDict/BeatsVer}}. The {{Template:DocsDict/KernelVer}} kernel includes: | ||
<!-- The following is not new but we can retain for people moving to Fedora 9 from Fedora 7. Remove for Fedora 10. PWF 2008-03-17 | <!-- The following is not new but we can retain for people moving to Fedora 9 from Fedora 7. Remove for Fedora 10. PWF 2008-03-17 | ||
| Line 14: | Line 10: | ||
* The kernel spec file is now named <code>kernel.spec</code> rather than <code>kernel-2.6.spec</code>. | * The kernel spec file is now named <code>kernel.spec</code> rather than <code>kernel-2.6.spec</code>. | ||
* The kernel spec file has new macros that ease the kernel building process. Refer to http://fedoraproject.org/wiki/Docs/CustomKernel for further information. | * The kernel spec file has new macros that ease the kernel building process. Refer to http://fedoraproject.org/wiki/Docs/CustomKernel for further information. | ||
* The kernel in Fedora {{Template:DocsDict/BeatsVer}} | * The kernel in Fedora {{Template:DocsDict/BeatsVer}} no longer loads modules by default for ISA sound cards. Load the module by hand using the command <code>modprobe module-name</code>, or put an entry in <code>/etc/modprobe.conf</code>. For example, for the Creative SoundBlaster AWE64, add the following entry: | ||
<pre>install snd-sbawe | |||
</pre> | </pre> | ||
<!-- End stuff to be removed for Fedora 10. PWF 2008-03-17 | <!-- End stuff to be removed for Fedora 10. PWF 2008-03-17 | ||
--> | --> | ||
* The Fedora kernel offers <code>paravirt_ops</code> support in <code>domU</code>, as part of the kernel team's efforts to reduce the work required to produce current Xen kernels. | * The Fedora kernel offers <code>paravirt_ops</code> support in <code>domU</code>, as part of the kernel team's efforts to reduce the work required to produce current Xen kernels. | ||
* Xen fully virtualized guests can directly boot a kernel and <code>initrd</code> image and pass kernel boot args. For more details refer to [http://fedoraproject.org/wiki/Features/XenFullvirtKernelBoot] . | * Xen fully virtualized guests can directly boot a kernel and <code>initrd</code> image and pass kernel boot args. For more details refer to [http://fedoraproject.org/wiki/Features/XenFullvirtKernelBoot]. | ||
=== Version === | === Version === | ||
| Line 31: | Line 26: | ||
To obtain a list of these patches, download the source RPM package and run the following command against it: | To obtain a list of these patches, download the source RPM package and run the following command against it: | ||
<pre>rpm -qpl kernel-<version>.src.rpm | <pre>rpm -qpl kernel-<version>.src.rpm</pre> | ||
</pre> | |||
=== Changelog === | === Changelog === | ||
| Line 38: | Line 32: | ||
To retrieve a log of changes to the package, run the following command: | To retrieve a log of changes to the package, run the following command: | ||
<pre>rpm -q --changelog kernel-<version> | <pre>rpm -q --changelog kernel-<version></pre> | ||
</pre> | |||
If you need a user friendly version of the changelog, refer to http://wiki.kernelnewbies.org/LinuxChanges. A short and full diff of the kernel is available from http://kernel.org/git. The Fedora version kernel is based on the Linus tree. | If you need a user friendly version of the changelog, refer to http://wiki.kernelnewbies.org/LinuxChanges. A short and full diff of the kernel is available from http://kernel.org/git. The Fedora version kernel is based on the Linus tree. | ||
| Line 49: | Line 42: | ||
{{Anchor|Kernel_Flavors}} | {{Anchor|Kernel_Flavors}} | ||
Fedora {{Template:DocsDict/BeatsVer}} | Fedora {{Template:DocsDict/BeatsVer}} includes the following kernel builds: | ||
* Native kernel, for use in most systems. Configured sources are available in the <code>kernel-devel</code> package. | * Native kernel, for use in most systems. Configured sources are available in the <code>kernel-devel</code> package. | ||
| Line 60: | Line 52: | ||
You may install kernel headers for all four kernel flavors at the same time. The files are installed in the <code>/usr/src/kernels/<version>[-PAE|-xen|-kdump] -<arch>/</code> tree. Use the following command: | You may install kernel headers for all four kernel flavors at the same time. The files are installed in the <code>/usr/src/kernels/<version>[-PAE|-xen|-kdump] -<arch>/</code> tree. Use the following command: | ||
<pre>su -c 'yum install kernel{,-PAE,-xen,-kdump}-devel' | <pre>su -c 'yum install kernel{,-PAE,-xen,-kdump}-devel'</pre> | ||
</pre> | |||
Select one or more of these flavors, separated by commas and no spaces, as appropriate. Enter the root password when prompted. | Select one or more of these flavors, separated by commas and no spaces, as appropriate. Enter the root password when prompted. | ||
{{Admon/note|x86 Kernel Includes Kdump|Both the x86_64 and the i686 kernels are relocatable, so they no longer require a separate kernel for kdump capability. PPC64 still requires a separate kdump kernel.}} | |||
{{Admon/note|Default Kernel Provides SMP|There is no separate SMP kernel available for Fedora on i386, x86_64, and ppc64. Multiprocessor support is provided by the native kernel.}} | |||
{{Admon/note|PowerPC Kernel Support|There is no support for Xen or kdump for the PowerPC architecture in Fedora. 32-bit PowerPC does still have a separate SMP kernel.}} | |||
=== Preparing for Kernel Development === | === Preparing for Kernel Development === | ||
Fedora {{Template:DocsDict/BeatsVer}} | Fedora {{Template:DocsDict/BeatsVer}} does not include the kernel-source package provided by older versions since only the kernel-devel package is required now to build external modules. Configured sources are available, as described [#Kernel_Flavors above]. | ||
{{Admon/important|Custom Kernel Building|For information on kernel development and working with custom kernels, refer to http://fedoraproject.org/wiki/Docs/CustomKernel.}} | |||
=== Reporting Bugs === | === Reporting Bugs === | ||
Refer to http://kernel.org/pub/linux/docs/lkml/reporting-bugs.html for information on reporting bugs in the Linux kernel. You may also use http://bugzilla.redhat.com for reporting bugs that are specific to Fedora. | Refer to http://kernel.org/pub/linux/docs/lkml/reporting-bugs.html for information on reporting bugs in the Linux kernel. You may also use http://bugzilla.redhat.com for reporting bugs that are specific to Fedora. | ||
Revision as of 19:27, 14 June 2008
Linux Kernel
This section covers changes and important information regarding the 2.6.27 based kernel in Fedora 25. The 2.6.27 kernel includes:
- Tickless support for x86 64bit systems (32 bit was added previously), which greatly improves power management.
- Some elements of the realtime kernel project.
- The kernel has a new version naming scheme to more closely match the upstream version naming scheme.
- The kernel spec file is now named
kernel.specrather thankernel-2.6.spec. - The kernel spec file has new macros that ease the kernel building process. Refer to http://fedoraproject.org/wiki/Docs/CustomKernel for further information.
- The kernel in Fedora 25 no longer loads modules by default for ISA sound cards. Load the module by hand using the command
modprobe module-name, or put an entry in/etc/modprobe.conf. For example, for the Creative SoundBlaster AWE64, add the following entry:
install snd-sbawe
- The Fedora kernel offers
paravirt_opssupport indomU, as part of the kernel team's efforts to reduce the work required to produce current Xen kernels. - Xen fully virtualized guests can directly boot a kernel and
initrdimage and pass kernel boot args. For more details refer to [1].
Version
Fedora may include additional patches to the kernel for improvements, bug fixes, or additional features. For this reason, the Fedora kernel may not be line-for-line equivalent to the so-called vanilla kernel from the kernel.org web site:
To obtain a list of these patches, download the source RPM package and run the following command against it:
rpm -qpl kernel-<version>.src.rpm
Changelog
To retrieve a log of changes to the package, run the following command:
rpm -q --changelog kernel-<version>
If you need a user friendly version of the changelog, refer to http://wiki.kernelnewbies.org/LinuxChanges. A short and full diff of the kernel is available from http://kernel.org/git. The Fedora version kernel is based on the Linus tree.
Customizations made for the Fedora version are available from http://cvs.fedoraproject.org .
Kernel Flavors
Fedora 25 includes the following kernel builds:
- Native kernel, for use in most systems. Configured sources are available in the
kernel-develpackage.
- The kernel-PAE, for use in 32-bit x86 systems with more than 4GB of RAM, or with CPUs that have a NX (No eXecute) feature. This kernel support both uniprocessor and multi-processor systems. Configured sources are available in the
kernel-PAE-develpackage.
- Virtualization kernel for use with the Xen emulator package. Configured sources are available in the
kernel-xen-develpackage.
You may install kernel headers for all four kernel flavors at the same time. The files are installed in the /usr/src/kernels/<version>[-PAE|-xen|-kdump] -<arch>/ tree. Use the following command:
su -c 'yum install kernel{,-PAE,-xen,-kdump}-devel'
Select one or more of these flavors, separated by commas and no spaces, as appropriate. Enter the root password when prompted.
x86 Kernel Includes Kdump
Both the x86_64 and the i686 kernels are relocatable, so they no longer require a separate kernel for kdump capability. PPC64 still requires a separate kdump kernel.
Both the x86_64 and the i686 kernels are relocatable, so they no longer require a separate kernel for kdump capability. PPC64 still requires a separate kdump kernel.
Default Kernel Provides SMP
There is no separate SMP kernel available for Fedora on i386, x86_64, and ppc64. Multiprocessor support is provided by the native kernel.
There is no separate SMP kernel available for Fedora on i386, x86_64, and ppc64. Multiprocessor support is provided by the native kernel.
PowerPC Kernel Support
There is no support for Xen or kdump for the PowerPC architecture in Fedora. 32-bit PowerPC does still have a separate SMP kernel.
There is no support for Xen or kdump for the PowerPC architecture in Fedora. 32-bit PowerPC does still have a separate SMP kernel.
Preparing for Kernel Development
Fedora 25 does not include the kernel-source package provided by older versions since only the kernel-devel package is required now to build external modules. Configured sources are available, as described [#Kernel_Flavors above].
Custom Kernel Building
For information on kernel development and working with custom kernels, refer to http://fedoraproject.org/wiki/Docs/CustomKernel.
For information on kernel development and working with custom kernels, refer to http://fedoraproject.org/wiki/Docs/CustomKernel.
Reporting Bugs
Refer to http://kernel.org/pub/linux/docs/lkml/reporting-bugs.html for information on reporting bugs in the Linux kernel. You may also use http://bugzilla.redhat.com for reporting bugs that are specific to Fedora.