* Bogus "APIC: NR_CPUS/possible_cpus limit of 4 reached" messages
@ 2016-10-06 11:27 Markus Trippelsdorf
2016-10-06 11:48 ` One Thousand Gnomes
0 siblings, 1 reply; 6+ messages in thread
From: Markus Trippelsdorf @ 2016-10-06 11:27 UTC (permalink / raw)
To: Gu Zheng; +Cc: linux-acpi, linux-kernel
On current trunk I get during boot:
[ 0.000000] APIC: NR_CPUS/possible_cpus limit of 4 reached. Processor 4/0x84 ignored.
[ 0.000000] APIC: NR_CPUS/possible_cpus limit of 4 reached. Processor 5/0x85 ignored.
I don't think these messages make much sense on a 4-core machine.
--
Markus
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Bogus "APIC: NR_CPUS/possible_cpus limit of 4 reached" messages
2016-10-06 11:27 Bogus "APIC: NR_CPUS/possible_cpus limit of 4 reached" messages Markus Trippelsdorf
@ 2016-10-06 11:48 ` One Thousand Gnomes
2016-10-06 11:52 ` Markus Trippelsdorf
0 siblings, 1 reply; 6+ messages in thread
From: One Thousand Gnomes @ 2016-10-06 11:48 UTC (permalink / raw)
To: Markus Trippelsdorf; +Cc: Gu Zheng, linux-acpi, linux-kernel
On Thu, 6 Oct 2016 13:27:37 +0200
Markus Trippelsdorf <markus@trippelsdorf.de> wrote:
> On current trunk I get during boot:
>
> [ 0.000000] APIC: NR_CPUS/possible_cpus limit of 4 reached. Processor 4/0x84 ignored.
> [ 0.000000] APIC: NR_CPUS/possible_cpus limit of 4 reached. Processor 5/0x85 ignored.
>
> I don't think these messages make much sense on a 4-core machine.
>
Four cores with or without hyperthreading ?
Alan
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Bogus "APIC: NR_CPUS/possible_cpus limit of 4 reached" messages
2016-10-06 11:48 ` One Thousand Gnomes
@ 2016-10-06 11:52 ` Markus Trippelsdorf
2016-10-07 13:26 ` Markus Trippelsdorf
0 siblings, 1 reply; 6+ messages in thread
From: Markus Trippelsdorf @ 2016-10-06 11:52 UTC (permalink / raw)
To: One Thousand Gnomes; +Cc: Gu Zheng, linux-acpi, linux-kernel
On 2016.10.06 at 12:48 +0100, One Thousand Gnomes wrote:
> On Thu, 6 Oct 2016 13:27:37 +0200
> Markus Trippelsdorf <markus@trippelsdorf.de> wrote:
>
> > On current trunk I get during boot:
> >
> > [ 0.000000] APIC: NR_CPUS/possible_cpus limit of 4 reached. Processor 4/0x84 ignored.
> > [ 0.000000] APIC: NR_CPUS/possible_cpus limit of 4 reached. Processor 5/0x85 ignored.
> >
> > I don't think these messages make much sense on a 4-core machine.
> >
>
> Four cores with or without hyperthreading ?
Without. This is a rather old AMD machine (AMD Phenom II X4 955).
--
Markus
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Bogus "APIC: NR_CPUS/possible_cpus limit of 4 reached" messages
2016-10-06 11:52 ` Markus Trippelsdorf
@ 2016-10-07 13:26 ` Markus Trippelsdorf
2016-10-07 13:55 ` Thomas Gleixner
0 siblings, 1 reply; 6+ messages in thread
From: Markus Trippelsdorf @ 2016-10-07 13:26 UTC (permalink / raw)
To: One Thousand Gnomes
Cc: Gu Zheng, linux-acpi, linux-kernel, Dou Liyang, Thomas Gleixner
On 2016.10.06 at 13:52 +0200, Markus Trippelsdorf wrote:
> On 2016.10.06 at 12:48 +0100, One Thousand Gnomes wrote:
> > On Thu, 6 Oct 2016 13:27:37 +0200
> > Markus Trippelsdorf <markus@trippelsdorf.de> wrote:
> >
> > > On current trunk I get during boot:
> > >
> > > [ 0.000000] APIC: NR_CPUS/possible_cpus limit of 4 reached. Processor 4/0x84 ignored.
> > > [ 0.000000] APIC: NR_CPUS/possible_cpus limit of 4 reached. Processor 5/0x85 ignored.
> > >
> > > I don't think these messages make much sense on a 4-core machine.
> > >
> >
> > Four cores with or without hyperthreading ?
>
> Without. This is a rather old AMD machine (AMD Phenom II X4 955).
CCing more people.
--
Markus
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Bogus "APIC: NR_CPUS/possible_cpus limit of 4 reached" messages
2016-10-07 13:26 ` Markus Trippelsdorf
@ 2016-10-07 13:55 ` Thomas Gleixner
2016-10-07 14:09 ` Markus Trippelsdorf
0 siblings, 1 reply; 6+ messages in thread
From: Thomas Gleixner @ 2016-10-07 13:55 UTC (permalink / raw)
To: Markus Trippelsdorf
Cc: One Thousand Gnomes, Gu Zheng, linux-acpi, linux-kernel, Dou Liyang
On Fri, 7 Oct 2016, Markus Trippelsdorf wrote:
> On 2016.10.06 at 13:52 +0200, Markus Trippelsdorf wrote:
> > On 2016.10.06 at 12:48 +0100, One Thousand Gnomes wrote:
> > > On Thu, 6 Oct 2016 13:27:37 +0200
> > > Markus Trippelsdorf <markus@trippelsdorf.de> wrote:
> > >
> > > > On current trunk I get during boot:
> > > >
> > > > [ 0.000000] APIC: NR_CPUS/possible_cpus limit of 4 reached. Processor 4/0x84 ignored.
> > > > [ 0.000000] APIC: NR_CPUS/possible_cpus limit of 4 reached. Processor 5/0x85 ignored.
> > > >
> > > > I don't think these messages make much sense on a 4-core machine.
> > > >
> > >
> > > Four cores with or without hyperthreading ?
> >
> > Without. This is a rather old AMD machine (AMD Phenom II X4 955).
That's due to the recent cpuid -> nodeid changes. The patch below should
fix it.
Thanks,
tglx
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index f266b8a92a9e..88c657b057e2 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2128,9 +2128,11 @@ int __generic_processor_info(int apicid, int version, bool enabled)
if (num_processors >= nr_cpu_ids) {
int thiscpu = max + disabled_cpus;
- pr_warning(
- "APIC: NR_CPUS/possible_cpus limit of %i reached."
- " Processor %d/0x%x ignored.\n", max, thiscpu, apicid);
+ if (enabled) {
+ pr_warning("APIC: NR_CPUS/possible_cpus limit of %i "
+ "reached. Processor %d/0x%x ignored.\n",
+ max, thiscpu, apicid);
+ }
disabled_cpus++;
return -EINVAL;
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: Bogus "APIC: NR_CPUS/possible_cpus limit of 4 reached" messages
2016-10-07 13:55 ` Thomas Gleixner
@ 2016-10-07 14:09 ` Markus Trippelsdorf
0 siblings, 0 replies; 6+ messages in thread
From: Markus Trippelsdorf @ 2016-10-07 14:09 UTC (permalink / raw)
To: Thomas Gleixner
Cc: One Thousand Gnomes, Gu Zheng, linux-acpi, linux-kernel, Dou Liyang
On 2016.10.07 at 15:55 +0200, Thomas Gleixner wrote:
> On Fri, 7 Oct 2016, Markus Trippelsdorf wrote:
> > On 2016.10.06 at 13:52 +0200, Markus Trippelsdorf wrote:
> > > On 2016.10.06 at 12:48 +0100, One Thousand Gnomes wrote:
> > > > On Thu, 6 Oct 2016 13:27:37 +0200
> > > > Markus Trippelsdorf <markus@trippelsdorf.de> wrote:
> > > >
> > > > > On current trunk I get during boot:
> > > > >
> > > > > [ 0.000000] APIC: NR_CPUS/possible_cpus limit of 4 reached. Processor 4/0x84 ignored.
> > > > > [ 0.000000] APIC: NR_CPUS/possible_cpus limit of 4 reached. Processor 5/0x85 ignored.
> > > > >
> > > > > I don't think these messages make much sense on a 4-core machine.
> > > > >
> > > >
> > > > Four cores with or without hyperthreading ?
> > >
> > > Without. This is a rather old AMD machine (AMD Phenom II X4 955).
>
> That's due to the recent cpuid -> nodeid changes. The patch below should
> fix it.
Indeed it does. Thanks for the quick fix.
--
Markus
^ permalink raw reply [flat|nested] 6+ messages in thread
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2016-10-06 11:27 Bogus "APIC: NR_CPUS/possible_cpus limit of 4 reached" messages Markus Trippelsdorf
2016-10-06 11:48 ` One Thousand Gnomes
2016-10-06 11:52 ` Markus Trippelsdorf
2016-10-07 13:26 ` Markus Trippelsdorf
2016-10-07 13:55 ` Thomas Gleixner
2016-10-07 14:09 ` Markus Trippelsdorf
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