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#1 What are the different types of kernel packages in Red Hat Enterprise Linux?
Red Hat Enterprise Linux contains the following kernel packages (some may not apply to your architecture):
* kernel - contains the kernel and following key features:
o Uniprocessor support (will utilize a single processor on multi-processor systems)
o Multi-processor support for Intel EM64T systems (Red Hat Enterprise Linux 3 only)
o 4GB RAM support on Intel and AMD x86 systems(1)
* kernel-BOOT - contains the installation kernel (x86 only)
o Uniprocessor support
* kernel-{*-}devel (Red Hat Enterprise Linux 4 only) - contains kernel header files
o replaces kernel-source
* kernel-doc - contains kernel documentation
o previously found in /usr/src/linux{-*}/Documentation
* kernel-hugemem (i686 only) - in addition to the options of kernel-smp:
o 4GB/4GB split - ~4GB of virtual address space for kernel resources and ~4GB for each user processor
o Should be utilized on systems/loads where more addressable kernel resources are required including greater than 16GB systems
* kernel-smp - in addition to the options of kernel:
o multi processor support (all architectures)
o PAE - Physical Address Extension (Intel x86 only) upto 16GB RAM(2)
* kernel-pcmcia-cs (Red Hat Enterprise Linux 3 only) - contains support for PCMCIA cards
* kernel-source (Red Hat Enterprise Linux 3 only) - contains complete source code for the Linux kernel
* kernel-utils - contains utilities that can be used to control the kernel or system hardware
* kernel-{*-}unsupported (Red Hat Enterprise Linux 3 only/some architectures)
o contains modules not supported by Red Hat, Inc. in any SLA
o is not installed during installation
o updates and fixes may not be provided over time
* (1) Red Hat Enterprise Linux product page should be reference for other configuration limits (http://www.redhat.com/rhel/details/limits/).
* (2) kernel-hugemem is required if system memory is greater than 16GB on x86 machines. x86_64 and AMD64 architectures support 64GB and EM64T supports 6GB.
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