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

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On Mon, 2019-07-22 at 14:51 -0400, 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].

This is not what I'd call a good idea. I've had to shoot it down
several times on internal mailing lists for RHEL, I think it's even
less a good idea for Fedora.

Skylake Pentium and Celeron models - dating from 2015 - don't have AVX
at all. Why do we want to break them? Has Intel promised they're not
going to pull a trick like that again?

If we really want to chase after Clear Linux benchmarks then fix ld.so
to know that avx2 is a capability (like we could for i686 + sse2).
Moving the baseline like this is far, far too aggressive.

- ajax
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