after running the installer on a PowerMac G5 no root filesystem found

[Michael Tuexen]

> On 14. Nov 2018, at 18:02, Justin Hibbits <chmeeedalf at gmail.com> wrote:
> 
> On Wed, 14 Nov 2018 11:52:45 -0500
> Dennis Clarke <dclarke at blastwave.org> wrote:
> 
>> <snip>
>>>>> 
>>>>> At first boot I get a load of text and then a strange prompt that
>>>>> seems to be asking where is the root filesystem? It also lists
>>>>> all the various filesystems found. I tried to enter
>>>>> ufs:/dev/adas2 and similar things but this gets me nothing but an
>>>>> unrecognized filesystem message.
>>>>> 
>>>>> So .. something obvious?  
>>>> Can you try setting the variable kern.smp.disabled to 1 at the
>>>> loader prompt?
>>>> If that helps, you can add
>>>> kern.smp.disabled=1
>>>> to /boot/leader.conf  
>>> I meant /boot/loader.conf.  
>> 
>> To do that at all I would need to be able to get to the root
>> filesystem.
> 
> You can do it at the loader.
> 
> set kern.smp.disabled=1
> boot
> 
>> 
>>>> I had all sorts of problems until I disabled SMP on my G5
>>>> PowerMacs. Without SMP they are running very stable.  
>> 
>> So FreeBSD can not run on ye old IBM PPC970 units with multiple cores
>> or multiple sockets?  That sounds like a critical bug.
> 
> It could until recently, due to my fault.  I can revert the change that
> caused it, but haven't yet, because I don't understand why it's causing
> the problem.  And I'm pretty confident it's not causing the mountroot
> issue (though, I was pretty confident it wouldn't cause any problem
> anyway, but that turned out to be false confidence).
OK, I did some testing. Reverting r334498 and not disabling smp results
in a usable, stable system. However, there are two things I observed that
are not working as good as with disabling smp:

1. After a while the fans get louder. Running sysctl -a dev.fcu.0
   gets them down again. After a while they will start to get
   louder again.
   When SMP is disabled, this is not an issue.

2. When shutting down the system,
   Waiting (max 60 seconds) for system thread `bufdaemon' to stop...
   Waiting (max 60 seconds) for system thread `bufspacedaemon-1' to stop...
   Waiting (max 60 seconds) for system thread `bufspacedaemon-0' to stop...
   times out.
   This is also not an issue when SMP is disabled.

So there are some issue with SMP even when reverting r334498.

Please let me know if you need more information or if you want me
to do any kind of testing.

Best regards
Michael

> 
>> 
>> Dennis Clarke
> 
> Can you somehow get a dmesg dump to post to the list?  I'm very curious
> to see what could be causing the problem you're seeing.
> 
> - Justin
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