On Wed, 17 Dec 2014 08:43:49 -0500
Josh Boyer <jwboyer(a)fedoraproject.org> wrote:
On Wed, Dec 17, 2014 at 3:00 AM, Timo Schöler
<timo(a)riscworks.net>
wrote:
> On 12/16/2014 08:03 PM, Michael J Wolf wrote:
>
>>> >> Hi
>>> >> We briefly discussed priorities for Fedora 22 and I had
>>> >> taken an action item to start an email conversation about
>>> >> this. So here is what I would like to see for Fedora 22.
>>> >>
>>> >> 1) Get the -mcpu and -mtune flags set properly for the LE
>>> >> build. Should be -mcpu=power7 -mtune=power8
>>> >
>>> > done, all packages that honour the Fedora system wide compiler
>>> > flags use them, if they don't it's a packaging bug
>>> >
>>> >> 2) Have a cloud image available
>>> >> 3) For BE I would like another subarch. Same packages as the
>>> >> current one but tuned for P8.
>>> >
>>> > you mean in addition to ppc64p7? can't we just switch ppc64p7
>>> > from -mcpu=power7 -mtune=power7 to -mcpu=power7 -mtune=power8?
>>>
>>> This makes sense to me as it then mirrors what we have in ppc64le
>>> and it saves having more targets.
>>
>> The disadvantage of this would be to cut off users that have Power
>> 7 systems and optimized code. So why would people want to
>> optimize from Fedora 21 to Fedora 22. You would be taking a big
>> step back in performance. I don't want to suggest keeping a
>> subarch for each type of POWER system out there. I
>> was thinking of keeping two. So when the next POWER arch that
>> comes out, the Power 7 subarch goes away and you would have Power
>> 8 and the new Power arch.
>
> That would mean that enthusiasts like myself, happily running
> Fedora on a Power 285 workstation, would lose Fedora?
Um, what version of Fedora are you running on that? As far as I know,
the recent (not End-of-Live) versions of Fedora for POWER don't really
support anything less than POWER6.
the kernel and user space should work on any Power CPU (some people
successfully updated to F-21 on Mac G5), the limitation is the installer
and how it is invoked
Dan