Re: SMP is broken on sparc64 with kernel 4.x/5.x

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Hello Ruediger!

On 10/9/20 4:40 PM, Wolf Ruediger Spielmann wrote:
> On Fri, 9 Oct 2020 16:30:35 +0200
> John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx> wrote:
> 
>> It mostly affects older machines, the newer machines such as T5220, T5240 and T5 that
>> we have in Debian have no issues with the latest kernel versions.
>>
>> We do have an UltraSPARC IIIi machine that we need to keep at 4.19 as the machine otherwise
>> becomes unstable.
> 
> I have absolute no stability issues.
> It's (in my opinion) pcpu-alloc:
> kernel 4.x/5.x: pcpu-alloc: [0] 0 1 
> kernel 3.x: pcpu-alloc: [0] 0 2 

Interesting. I have not yet seen this issue on any of our Debian development
machines. What distribution are you running? Is this Gentoo?

Our of curiosity, could you give it a go with Debian?

> https://cdimage.debian.org/cdimage/ports/2020-08-19/debian-10.0.0-sparc64-NETINST-1.iso

> Is it fixable? Or will it stay in state "broken" ?

Of course, it would be fixed we know what's wrong.

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz@xxxxxxxxxx
`. `'   Freie Universitaet Berlin - glaubitz@xxxxxxxxxxxxxxxxxxx
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913



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