On Tue, Jun 15, 2021 at 5:50 PM Fabio Valentini <decatho...@gmail.com> wrote: > > On Tue, Jun 15, 2021 at 11:35 PM Neal Gompa <ngomp...@gmail.com> wrote: > > > > Hey all, > > > > Earlier this week, I was helping with processing features for openSUSE > > Leap 15.4[1] and I discovered that they're planning on introducing > > x86_64-v2 to openSUSE soon. The reference for this change was that > > RHEL 9 is going to use x86_64-v2[2]. Additionally, other distributions > > have been considering bumping up to v2 or v3[3][4]. > > > > Some cursory examination of the new x86_64 sublevels seem to indicate > > that x86_64-v2 goes back to roughly 2007~2008, merely cutting off the > > first couple of generations of x86_64 CPUs from Intel and AMD. I > > personally don't have any computers that don't have support for > > x86_64-v2 anymore. > > > > Does anyone know if anyone is planning to propose this for Fedora > > anytime soon, either as an addon architecture (like what Arch is > > doing) or an upgrade of our x86_64 baseline like RHEL is doing? > > > > [1]: https://en.opensuse.org/Feature_Planning_15.4 > > [2]: > > https://developers.redhat.com/blog/2021/01/05/building-red-hat-enterprise-linux-9-for-the-x86-64-v2-microarchitecture-level > > [3]: https://ml.mageia.org/l/arc/dev/2021-02/msg00583.html > > [4]: > > https://www.phoronix.com/scan.php?page=news_item&px=Arch-Linux-x86-64-v3-Port-RFC > > Uhmmmm ... you mean something like this? > https://fedoraproject.org/wiki/Changes/x86-64_micro-architecture_update > Rejected by FESCo two years ago: https://pagure.io/fesco/issue/2198 > > If I remember correctly, it was shot down pretty quickly on the devil > list, because Intel still produced CPUs that do not support AVX2. > Bumping the baseline to x86_64v2 would be different, since AVX is not > part of that (but only x86_64v3). >
Yeah, I think that proposal was not workable because of AVX2. The x86_64-v2 subarch adds SSSE3, SSE4.2, POPCNT, and CMPXCHG16B to the current x86_64 baseline. All of these instructions were present in the first Intel Macs launched in 2007, as I recall. > Different question: How is the runtime CPU feature detection / > dispatch support in glibc coming along? Shouldn't this "work" by now? > No idea, good question, though! -- 真実はいつも一つ！/ Always, there's only one truth! _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
