Documentation Kernel Beat

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<pre>#!html
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{{header|docs}}
==Linux Kernel==</pre>
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This section covers changes and important information regarding the {{Template:DocsDict/KernelVer}}
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{{Docs_beat_open}}
based kernel in Fedora {{Template:DocsDict/BeatsVer}}
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.  The {{Template:DocsDict/KernelVer}}
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  kernel includes:
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<!-- 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
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-->
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* Tickless support for x86 64bit systems (32 bit was added previously), which greatly improves power management.
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* Some elements of the realtime kernel project.
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* The kernel has a new version naming scheme to more closely match the upstream version naming scheme.
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* The kernel spec file is now named <code>kernel.spec</code> rather than <code>kernel-2.6.spec</code>.
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* The kernel spec file has new macros that ease the kernel building process. Refer to http://fedoraproject.org/wiki/Docs/CustomKernel for further information.
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* The kernel in Fedora {{Template:DocsDict/BeatsVer}}
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  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:
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  <pre>install snd-sbawe
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</pre>
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<!-- End stuff to be removed for Fedora 10.  PWF 2008-03-17
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-->
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* 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.
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* 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] .
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=== Version ===
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[[Category:Docs Project]]
 
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[[Category:Draft documentation]]
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:
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[[Category:Documentation beats]]
 
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http://www.kernel.org/
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To obtain a list of these patches, download the source RPM package and run the following command against it:
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<pre>rpm -qpl kernel-<version>.src.rpm
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</pre>
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=== Changelog ===
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To retrieve a log of changes to the package, run the following command:
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<pre>rpm -q --changelog kernel-<version>
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</pre>
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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.
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Customizations made for the Fedora version are available from http://cvs.fedoraproject.org .
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=== Kernel Flavors ===
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{{Anchor|Kernel_Flavors}}
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Fedora {{Template:DocsDict/BeatsVer}}
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  includes the following kernel builds:
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* Native kernel, for use in most systems.  Configured sources are available in the <code>kernel-devel</code> package.
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* 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 <code>kernel-PAE-devel</code> package.
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* Virtualization kernel for use with the Xen emulator package. Configured sources are available in the <code>kernel-xen-devel</code> package.
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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:
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<pre>su -c 'yum install kernel{,-PAE,-xen,-kdump}-devel'
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</pre>
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Select one or more of these flavors, separated by commas and no spaces, as appropriate.  Enter the root password when prompted.
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Admonition("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.") 
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Admonition("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.") 
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Admonition("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.") 
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=== Preparing for Kernel Development ===
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Fedora {{Template:DocsDict/BeatsVer}}
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  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] .
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Admonition("important", "Custom Kernel Building", "For information on kernel development and working with custom kernels, refer to http://fedoraproject.org/wiki/Docs/CustomKernel.") 
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=== Reporting Bugs ===
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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.
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Revision as of 15:19, 15 January 2012

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