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* Name: [[User:notting| Jakub Jelinek]] | * Name: [[User:notting| Jakub Jelinek]] | ||
* Name: [[User:kyle| Kyle McMartin]] | * Name: [[User:kyle| Kyle McMartin]] | ||
* email: notting@redhat.com, jakub@redhat.com, kmcmartin@redhat.com | * email: notting@redhat.com, jakub@redhat.com, kmcmartin@redhat.com | ||
== Current status == | == Current status == | ||
* Targeted release: [[Releases/11 | Fedora 11 ]] | * Targeted release: [[Releases/11 | Fedora 11 ]] | ||
* Last updated: 2009- | * Last updated: 2009-03-05 | ||
* Percentage of completion: | * Percentage of completion: 100% | ||
== Detailed Description == | == Detailed Description == | ||
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The main user-visible changes would be: | The main user-visible changes would be: | ||
* 32-bit x86 would be built for i586 by default. | * 32-bit x86 would be built for i586 by default. | ||
* The PAE kernel would be installed on other 32-bit hardware, where it is supported | * The PAE kernel would be installed on other 32-bit hardware, where it is supported | ||
== Benefit to Fedora == | == Benefit to Fedora == | ||
By optimizing better for the architectures which we support, we give better performance | By optimizing better for the architectures which we support, we give better performance | ||
to our users. | to our users. | ||
By using the PAE kernel where appropriate, we allow features like ExecShield to be used. | By using the PAE kernel where appropriate, we allow features like ExecShield to be used. | ||
| Line 40: | Line 34: | ||
== Scope == | == Scope == | ||
* The default 32-bit x86 target in koji would be changed from i386 to i586 | * The default 32-bit x86 target in koji would be changed from i386 to i586 | ||
* yum and anaconda would need changes to select the proper kernel | * yum and anaconda would need changes to select the proper kernel | ||
* The default compiler flags for gcc in redhat-rpm-config would be changed as follows: | * The default compiler flags for gcc in redhat-rpm-config would be changed as follows: | ||
** i386: -march=i586 -mtune=generic | ** i386: -march=i586 -mtune=generic | ||
| Line 49: | Line 40: | ||
* The required kernel for glibc would be changed to 2.6.18 | * The required kernel for glibc would be changed to 2.6.18 | ||
* binutils for ix86 would be compiled to support x86_64 output | * binutils for ix86 would be compiled to support x86_64 output | ||
* A mass rebuild would need to be done for the RPM architecture changes and the compiler flag changes | * A mass rebuild would need to be done for the RPM architecture changes and the compiler flag changes | ||
== How To Test == | == How To Test == | ||
Install 32-bit Fedora on PAE-supporting 32-bit hardware (in other words: | Install 32-bit Fedora on PAE-supporting 32-bit hardware (in other words: | ||
Pentium II/III/4, or Atom.) Make sure the PAE kernel is the default. | Pentium II/III/4, or Atom.) Make sure the PAE kernel is the default. | ||
| Line 63: | Line 50: | ||
== User Experience == | == User Experience == | ||
Users of the x86 distribution should notice slight speed improvements. | Users of the x86 distribution should notice slight speed improvements. | ||
| Line 77: | Line 60: | ||
For x86_64-on-32: do not ship x86_64 on 32-bit x86, only ship 32-bit | For x86_64-on-32: do not ship x86_64 on 32-bit x86, only ship 32-bit | ||
kernels. | kernels. This contingency plan has been enacted. | ||
For PAE-on-32: default to the normal i686 kernel, with PAE an option. | For PAE-on-32: default to the normal i686 kernel, with PAE an option. | ||
== Documentation == | == Documentation == | ||
None specifically. | * None specifically. | ||
== Release Notes == | == Release Notes == | ||
In Fedora 11, the following changes have been made to architecture support: | In Fedora 11, the following changes have been made to architecture support: | ||
* By default, the PAE kernel will be used on 32-bit hardware, where appropriate | * By default, the PAE kernel will be used on 32-bit hardware, where appropriate | ||
== Comments and Discussion == | == Comments and Discussion == | ||
* See [[Talk:Features/ArchitectureSupport]] | * See [[Talk:Features/ArchitectureSupport]] | ||
[[Category:FeatureAcceptedF11]] | |||
<!-- When your feature page is completed and ready for review --> | <!-- When your feature page is completed and ready for review --> | ||
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Latest revision as of 17:29, 17 April 2009
ArchitectureSupport
Summary
Change what architectures Fedora supports, and what Fedora provides on those architectures.
Owner
- Name: Bill Nottingham
- Name: Jakub Jelinek
- Name: Kyle McMartin
- email: notting@redhat.com, jakub@redhat.com, kmcmartin@redhat.com
Current status
- Targeted release: Fedora 11
- Last updated: 2009-03-05
- Percentage of completion: 100%
Detailed Description
For Fedora 11, we'd like to revisit what architectures Fedora supports, and change some of our defaults so that we work better on those architectures.
The main user-visible changes would be:
- 32-bit x86 would be built for i586 by default.
- The PAE kernel would be installed on other 32-bit hardware, where it is supported
Benefit to Fedora
By optimizing better for the architectures which we support, we give better performance to our users.
By using the PAE kernel where appropriate, we allow features like ExecShield to be used.
By changing the minimum kernel for glibc, we allow the removal of various hacks, tests, and workarounds in the glibc code.
Scope
- The default 32-bit x86 target in koji would be changed from i386 to i586
- yum and anaconda would need changes to select the proper kernel
- The default compiler flags for gcc in redhat-rpm-config would be changed as follows:
- i386: -march=i586 -mtune=generic
- s390x: -march=z9-109 -mtune=z10
- The required kernel for glibc would be changed to 2.6.18
- binutils for ix86 would be compiled to support x86_64 output
- A mass rebuild would need to be done for the RPM architecture changes and the compiler flag changes
How To Test
Install 32-bit Fedora on PAE-supporting 32-bit hardware (in other words: Pentium II/III/4, or Atom.) Make sure the PAE kernel is the default.
Additional testing could benchmark apps to see any difference in code size and app speed.
User Experience
Users of the x86 distribution should notice slight speed improvements.
Dependencies
No external dependencies outside the changes listed in Scope.
Contingency Plan
For compiler flags and default RPM architecture: if we need to change after the mass rebuild, we'd need another mass rebuild.
For x86_64-on-32: do not ship x86_64 on 32-bit x86, only ship 32-bit kernels. This contingency plan has been enacted.
For PAE-on-32: default to the normal i686 kernel, with PAE an option.
Documentation
- None specifically.
Release Notes
In Fedora 11, the following changes have been made to architecture support:
- By default, the PAE kernel will be used on 32-bit hardware, where appropriate
Comments and Discussion