On Tue, 15 Jun 2021 at 17:35, 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]. > > Wasn't the last time this was looked at was https://fedoraproject.org/wiki/Changes/x86-64_micro-architecture_update? That spawned the multi hundred thread "Fedora 32 System-Wide Change proposal: x86-64 micro-architecture update" but I think this was to push towards level 3. However my review of that thread and some others seemed to show there was no stomach to move Fedora up without many people dropping packages etc.
I used this https://unix.stackexchange.com/questions/631217/how-do-i-check-if-my-cpu-supports-x86-64-v2 to see what cpu instructions are at each level ``` #!/usr/bin/awk -f BEGIN { while (!/flags/) if (getline < "/proc/cpuinfo" != 1) exit 1 if (/lm/&&/cmov/&&/cx8/&&/fpu/&&/fxsr/&&/mmx/&&/syscall/&&/sse2/) level = 1 if (level == 1 && /cx16/&&/lahf/&&/popcnt/&&/sse4_1/&&/sse4_2/&&/ssse3/) level = 2 if (level == 2 && /avx/&&/avx2/&&/bmi1/&&/bmi2/&&/f16c/&&/fma/&&/abm/&&/movbe/&&/xsave/) level = 3 if (level == 3 && /avx512f/&&/avx512bw/&&/avx512cd/&&/avx512dq/&&/avx512vl/) level = 4 if (level > 0) { print "CPU supports x86-64-v" level; exit level + 1 } exit 1 } ``` level 2 is avx and avx2 plus some others. > 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 > > -- > 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 > -- Stephen J Smoogen. I've seen things you people wouldn't believe. Flame wars in sci.astro.orion. I have seen SPAM filters overload because of Godwin's Law. All those moments will be lost in time... like posts on BBS... time to reboot.
_______________________________________________ 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
