On Sun, Apr 13, 2025, 13:18 Andreas K. Huettel <dilfridge@gentoo.org> wrote:

Draft to be published ASAP, feedback welcome...

Title: Gentoo raises s390x baseline to z10
Author: Andreas K. Hüttel <dilfridge@gentoo.org>
Posted: xxxx-xx-xx
Revision: x
News-Item-Format: 2.0
Display-If-Profile: default/linux/s390/17.0/s390x
Display-If-Profile: default/linux/s390/17.0/s390x/systemd/merged-usr Display-If-Profile: default/linux/s390/23.0/split-usr/s390x Display-If-Profile: default/linux/s390/23.0/s390x
Display-If-Profile: default/linux/s390/23.0/s390x/systemd

Since more and more software for s390x assumes the presence of a more
recent processor, we will raise in 64bit s390x profiles the ISA baseline
for the catalyst stage builds and the published binary packages from
z900 to z10 (i.e., -march=z10).

This wording is a little awkward. I suggest "[...] we will raise the ISA baseline in 64bit s390x profiles for the catalyst stage builds [...]"

* If you are running an installation and emerge locally from source,
this does not affect you.

* If you are running an installation and use our binary packages,
please make sure you have compatibility for z10 or switch to building
from source.

* The 64bit s390x stages will only work with machines compatible with
z10.

* This does not affect the 31bit s390 stages or packages.

The z10 Enterprise Class (2097 series) was introduced in February 2008 [1], which essentially means everyone except hardware archaeologists should be fine.

Note that z10 is still a very conservative setting; on modern machines
a newer ISA is strongly recommended.

[1] https://en.wikipedia.org/wiki/IBM_Z

--
Andreas K. Hüttel
dilfridge@gentoo.org
Gentoo Linux developer
(council, toolchain, base-system, perl, libreoffice)

-dwfreed

<div dir="auto"><div><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Sun, Apr 13, 2025, 13:18 Andreas K. Huettel &lt;<a href="mailto:dilfridge@gentoo.org">dilfridge@gentoo.org</a>&gt; wrote:<br></div><blockquote class="
gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Draft to be published ASAP, feedback welcome...<br>



Title: Gentoo raises s390x baseline to z10<br>
Author: Andreas K. Hüttel &lt;<a href="mailto:dilfridge@gentoo.org" target="_blank" rel="noreferrer">dilfridge@gentoo.org</a>&gt;<br>
Posted: xxxx-xx-xx<br>
Revision: x<br>
News-Item-Format: 2.0<br>
Display-If-Profile: default/linux/s390/17.0/s390x<br>
Display-If-Profile: default/linux/s390/17.0/s390x/systemd/merged-usr<br> Display-If-Profile: default/linux/s390/23.0/split-usr/s390x<br> Display-If-Profile: default/linux/s390/23.0/s390x<br>
Display-If-Profile: default/linux/s390/23.0/s390x/systemd<br>

Since more and more software for s390x assumes the presence of a more<br> recent processor, we will raise in 64bit s390x profiles the ISA baseline<br> for the catalyst stage builds and the published binary packages from <br>
z900 to z10 (i.e., -march=z10).<br></blockquote></div></div><div dir="auto"><br></div><div dir="auto">This wording is a little awkward.  I suggest &quot;[...] we will raise the ISA baseline in 64bit s390x profiles for the catalyst stage builds [...]&
quot;</div><div dir="auto"><br></div><div dir="auto"><div class="gmail_quote gmail_quote_container"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">

* If you are running an installation and emerge locally from source, <br>
  this does not affect you.<br>

* If you are running an installation and use our binary packages, <br>
  please make sure you have compatibility for z10 or switch to building<br>
  from source.<br>

* The 64bit s390x stages will only work with machines compatible with<br>
  z10.<br>

* This does not affect the 31bit s390 stages or packages.<br>

The z10 Enterprise Class (2097 series) was introduced in February 2008 [1],<br> which essentially means everyone except hardware archaeologists should be<br> fine.<br>

Note that z10 is still a very conservative setting; on modern machines<br>
a newer ISA is strongly recommended.<br>

[1] <a href="https://en.wikipedia.org/wiki/IBM_Z" rel="noreferrer noreferrer" target="_blank">https://en.wikipedia.org/wiki/IBM_Z</a><br>

-- <br>
Andreas K. Hüttel<br>
<a href="mailto:dilfridge@gentoo.org" target="_blank" rel="noreferrer">dilfridge@gentoo.org</a><br>
Gentoo Linux developer<br>
(council, toolchain, base-system, perl, libreoffice)</blockquote></div></div><div dir="auto"><br></div><div dir="auto">-dwfreed</div><div dir="auto"></div></div>

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