[OE-core] [PATCH 00/15] Update x86 tune files

[Darren Hart]

On Tue, 2014-01-21 at 14:40 -0800, Darren Hart wrote:
> All,
> 
> The following lays the groundwork for some rethinking of support for x86
> platforms. In particular, the meta-intel layer will undergo some major
> refactoring once this is merged. We believe it is of value to keep as much
> of the tune files available in oe-core as possible, rather than isolating
> them all in meta-intel.
> 
> This series renames the x86-related tune files, documents best practices,
> updates the core2 tune file, adds a corei7 tune file, and updates the dependent
> machine configs. This spans oe-core and poky and I feel is best viewed as a
> whole. Please forgive the cross-post.
> 
> The new corei7 tune file applies to Nehalem and Silvermont (Bay Trail) CPUs
> which support up to SSE4.2. This provides an appropriate demarcation line while
> maximizing compatibility as well as including optimal support for the current
> generation of the embedded CPUs (Bay Trail) by including it in the new tune. AVX
> (Sandy Bridge and beyond) is not included as that would not apply to Bay Trail,
> although it can easily be added in a corei7-avx tune file as an additional
> patch for users who care more about the last few percent of performance over
> compatibility and consolidation.
> 
> An important note and likely a point of contention: The core2 update changes the
> core2 arch to core2-32, making the 32 bit explicit rather than implied in order
> to provide a consistent naming scheme going forward with newer tunes where
> 64 bit would be logical assumption if not explicitly stated. See patch 5/15 for
> details on this bit.
> 
> Finally, update the machines dependent on these tune files to use the new names.
> As we remove x86_64, the 64b x86 machines now build as core2-64 for maximum
> compatibility.


I missed a couple things I'm getting to now:

* the yocto-bsp substrates
* the inclusion of XSERVER_IA32_* in the genericx86 BSPs
* the eglibc-ld.inc file .... I need some help here, but am 
  updating the core2 references and adding corei7... do we 
  really have to do this for every tune file!?!?
* profile-manual core2 references

Coming in v2

-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel