Re: Fedora 32 System-Wide Change proposal: x86-64 micro-architecture update

2019-07-22 Thread Jason L Tibbitts III
> "JLT" == Jason L Tibbitts writes: JLT> And, let's see, I'd have to toss out five desktops (which isn't too JLT> bad, I guess) I was wrong. It would be 36 desktops. Being charitable requires me to assume this was proposed without adequate consideration of just how much hardware is involve

Re: Fedora 32 System-Wide Change proposal: x86-64 micro-architecture update

2019-07-22 Thread Jason L Tibbitts III
> "BC" == Ben Cotton writes: BC> * Other developers: Other developers may have to adjust test suites BC> which expect exact floating point results, and correct linking with BC> libatomic. They will also have to upgrade their x86-64 BC> machines to something that can execute AVX2 instructions.

Re: Fedora 32 System-Wide Change proposal: x86-64 micro-architecture update

2019-07-22 Thread Tom Hughes
On 22/07/2019 19:51, Ben Cotton wrote: After preliminary discussions with CPU vendors, we propose AVX2 as the new baseline. AVX2 support was introduced into CPUs from 2013 to 2015. See [https://en.wikipedia.org/wiki/Advanced_Vector_Extensions#CPUs_with_AVX2 CPUs with AVX2]. Going all the way

Fedora 32 System-Wide Change proposal: x86-64 micro-architecture update

2019-07-22 Thread Ben Cotton
https://fedoraproject.org/wiki/Changes/x86-64_micro-architecture_update == Summary == Fedora currently uses the original K8 micro-architecture (without 3DNow! and other AMD-specific parts) as the baseline for its x86_64 architecture. This baseline dates back to 2003 and has not been updated since

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