Re: [patch 00/37] cpu/hotplug, x86: Reworked parallel CPU bringup

[Paul Menzel <pmenzel@xxxxxxxxxxxxx>]

Dear Thomas,


Am 18.04.23 um 10:40 schrieb Thomas Gleixner:
> On Tue, Apr 18 2023 at 08:58, Thomas Gleixner wrote:
> > On Mon, Apr 17 2023 at 19:40, Paul Menzel wrote:
> > > Am 17.04.23 um 16:48 schrieb Thomas Gleixner:
> > >
> > > > On Mon, Apr 17 2023 at 13:19, Paul Menzel wrote:
> > > > > Am 15.04.23 um 01:44 schrieb Thomas Gleixner:
> > > > > [    0.258193] smpboot: CPU0: AMD A6-6400K APU with Radeon(tm) HD Graphics 
> > > > > (family: 0x15, model: 0x13, stepping: 0x1)
> > > > > […]
> > > > > [    0.259329] smp: Bringing up secondary CPUs ...
> > > > > [    0.259527] x86: Booting SMP configuration:
> > > > > [    0.259528] .... node  #0, CPUs:      #1
> > > > > [    0.261007] After schedule_preempt_disabled
> > > > > [   10.260990] CPU1 failed to report alive state
> > > > Weird. CPU1 fails to come up and report that it has reached the
> > > > synchronization point.
> > > >
> > > > Does it work when you add cpuhp.parallel=off on the kernel command line?
> > > Yes, the ten seconds delay is gone with `cpuhp.parallel=off`.
> > >
> > > There was a patch set in the past, that worked on that device. I think
> > > up to v4 it did *not* work at all and hung [1]. I need some days to
> > > collect the results again.
> > Can you please apply the patch below on top of the pile remove the
> > command line option again?
> Bah. That patch does not make any sense at all. Not enough coffee.
>
> Can you please provide the output of cpuid?
Of course. Here the top, and the whole output is attached.

```
CPU 0:
   vendor_id = "AuthenticAMD"
   version information (1/eax):
      processor type  = primary processor (0)
      family          = 0xf (15)
      model           = 0x3 (3)
      stepping id     = 0x1 (1)
      extended family = 0x6 (6)
      extended model  = 0x1 (1)
      (family synth)  = 0x15 (21)
      (model synth)   = 0x13 (19)
      (simple synth)  = AMD (unknown type) (Richland RL-A1) 
[Piledriver], 32nm
[…]
```


Kind regards,

Paul

Attachment: cpuid.txt
Description: Text document