On Thu, Jul 21, 2022 at 10:39:55PM +0200, Fabio Valentini wrote: > On Wed, Jul 20, 2022 at 4:56 PM Dan Horák <d...@danny.cz> wrote: > > > > On Wed, 20 Jul 2022 16:48:02 +0200 > > Miro Hrončok <mhron...@redhat.com> wrote: > > > > > On 15. 07. 22 23:48, Ben Cotton wrote: > > > > == Summary == > > > > Move the minimal architecture level for IBM Z hardware (the s390x > > > > architecture) to z13 to benefit from the new features and better > > > > performance in the newer CPU. > > > > > > I suppose, considering the mass rebuild is today, that this change only > > > makes > > > sense for Fedora 38. Or do we really want to change this without > > > rebuilding > > > everything? > > > > it still makes sense to me, we can change default in the kernel, next > > glibc build will pick it, so the majority of the perf improvements will > > be available. And if something should go wrong (although I don't expect > > that), then the individual package builds will get the change and it > > will be easier to fix them incrementally, rather having a big(er) batch > > from the rebuild at once. > > I'd argue that this should've been submitted as a System-Wide Change. > If I understand correctly, this change would affect every package that > is built on s390x? > As such, it would've been way too late for Fedora 37, as it should > also have been ready before the mass rebuild. > > And I'd also argue that not having this change ready before the mass > rebuild, and only pushing selective builds is not a good idea. > If there is fallout from this change, it would be better to catch it > at or before the mass rebuild. > Otherwise, if the switch is made *after*, potential breakage could > well happen over the whole lifetime of Fedora 37 (i.e. after GA and > until EOL), as more and more packages are rebuilt, which would be a > completely unpredictable source of issues.
Note, in terms of software compatibility with newer CPU baseline, this has already been widely tested given that RHEL-8 built with the z13 baseline and RHEL-9 built with z14 baseline. I do agree though that this feels like the kind of change that makes sense todo all in one go at a mass rebuild, rather than drip-feeding per-package. Given Fedora has lagged waaaaaay behind RHEL in its s390x baseline for years, I'm not seeing why there's a need to rush this in Fedora late in the F37 cycle, rather than co-ordinating it for the F38 release to leverage a mass rebuild. With regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :| _______________________________________________ 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
