[gentoo-dev] news item draft: Gentoo raises s390x baseline to z10

[gentoo-dev] news item draft: Gentoo raises s390x baseline to z10

[Andreas K. Huettel]

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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).

* 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)

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[gentoo-dev] Re: news item draft: Gentoo raises s390x baseline to z10

[Doug Freed]

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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

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Re: [gentoo-dev] news item draft: Gentoo raises s390x baseline to z10

[Sam James]

"Andreas K. Huettel" <dilfridge@gentoo.org> writes:

> 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).
>
> * 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.

LGTM. Just for completeness: motivation for this was partly
https://bugs.gentoo.org/936790 but we'd had other issues before with
e.g. nettle I think.

Re: [gentoo-dev] news item draft: Gentoo raises s390x baseline to z10

[Sam James]

Sam James <sam@gentoo.org> writes:

> "Andreas K. Huettel" <dilfridge@gentoo.org> writes:
>
>> 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).
>>
>> * 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.
>
> LGTM. Just for completeness: motivation for this was partly
> https://bugs.gentoo.org/936790 but we'd had other issues before with
> e.g. nettle I think.

(I mean just on the ML, of course not suggesting editing the post.)