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4.10-rc1: thinkpad x60: who ate my cpu?

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  4.10-rc1: thinkpad x60: who ate my cpu? Pavel Machek <pavel@ucw.cz> - 2017-01-08 23:20 +0100
    Re: 4.10-rc1: thinkpad x60: who ate my cpu? Pavel Machek <pavel@ucw.cz> - 2017-01-09 10:40 +0100
      Re: 4.10-rc1: thinkpad x60: who ate my cpu? Woody Suwalski <terraluna977@gmail.com> - 2017-01-13 02:20 +0100
        Re: 4.10-rc1: thinkpad x60: who ate my cpu? Pavel Machek <pavel@ucw.cz> - 2017-01-14 12:40 +0100
          Re: 4.10-rc1: thinkpad x60: who ate my cpu? Pavel Machek <pavel@ucw.cz> - 2017-01-15 11:00 +0100

#1553950 — 4.10-rc1: thinkpad x60: who ate my cpu?

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Hi!

I used to have two cpus, and Thinkpad X60 should have two cores, but I
only see one on 4.10-rc1. This machine went through many
suspend/resume cycles. When backups finish, I'll try -rc2.

pavel@duo:~$ uname -a
Linux duo 4.10.0-rc1+ #304 SMP Mon Dec 26 10:33:24 CET 2016 i686
GNU/Linux
pavel@duo:~$ zcat /proc/config.gz | grep SMP
CONFIG_X86_32_SMP=y
CONFIG_GENERIC_SMP_IDLE_THREAD=y
CONFIG_SMP=y
# CONFIG_X86_BIGSMP is not set
CONFIG_PM_SLEEP_SMP=y
pavel@duo:~$ cat /proc/cpuinfo
processor    : 0
vendor_id    : GenuineIntel
cpu family   : 6
model	       : 14
model name     : Genuine Intel(R) CPU           T2400  @ 1.83GHz
stepping       : 8
cpu MHz	       	 : 1833.000
cache size	 : 2048 KB
physical id	 : 0
siblings : 1
core id	   : 0
cpu cores  : 1
apicid	     : 0
initial apicid : 0
fdiv_bug       : no
f00f_bug       : no
coma_bug       : no
fpu	       	 : yes
fpu_exception	 : yes
cpuid level	 : 10
wp    		 : yes
flags		   : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr
pge mca cmov clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx
constant_tsc arch_perfmon bts aperfmperf pni monitor vmx est tm2 xtpr
pdcm dtherm
bugs	:
bogomips	: 3657.62
clflush size	: 64
cache_alignment	: 64
address sizes	: 32 bits physical, 32 bits virtual
power management:

pavel@duo:~$


									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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#1554171

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Hi!

> I used to have two cpus, and Thinkpad X60 should have two cores, but I
> only see one on 4.10-rc1. This machine went through many
> suspend/resume cycles. When backups finish, I'll try -rc2.

Whoever did it, he seems to have returned the cpu in -rc3. All seems
to be good now.
								Pavel
								

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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#1557942

Pavel Machek wrote:
> Hi!
>
>> I used to have two cpus, and Thinkpad X60 should have two cores, but I
>> only see one on 4.10-rc1. This machine went through many
>> suspend/resume cycles. When backups finish, I'll try -rc2.
> Whoever did it, he seems to have returned the cpu in -rc3. All seems
> to be good now.
> 								Pavel
> 								
Actually since you have mentioned - I have checked my x60 - same problem 
- only one CPU. However I was running 4.8.13 with uptime 33 days, 
multiple sleep/wake-ups.
Installed a current EOL 4.8.17 and rebooted - I see 2 CPUs. So the issue 
is older then 4.10 kernel, and I suspect it is the CPU hotplug / wakeup 
related...

Woody

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#1558950

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Hi!

On Thu 2017-01-12 20:19:31, Woody Suwalski wrote:
> Pavel Machek wrote:
> >Hi!
> >
> >>I used to have two cpus, and Thinkpad X60 should have two cores, but I
> >>only see one on 4.10-rc1. This machine went through many
> >>suspend/resume cycles. When backups finish, I'll try -rc2.
> >Whoever did it, he seems to have returned the cpu in -rc3. All seems
> >to be good now.

> Actually since you have mentioned - I have checked my x60 - same problem -
> only one CPU. However I was running 4.8.13 with uptime 33 days, multiple
> sleep/wake-ups.
> Installed a current EOL 4.8.17 and rebooted - I see 2 CPUs. So the issue is
> older then 4.10 kernel, and I suspect it is the CPU hotplug / wakeup
> related...

Hmm. So I seen two cores in -rc3 after boot. But it is quite well
possible that -rc1 was ok just after boot, too, and problem happened
sometime later (probably during suspend/resume cycles). Let me go back
to -rc1 to check.

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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#1559187

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On Sat 2017-01-14 12:30:54, Pavel Machek wrote:
> Hi!
> 
> On Thu 2017-01-12 20:19:31, Woody Suwalski wrote:
> > Pavel Machek wrote:
> > >Hi!
> > >
> > >>I used to have two cpus, and Thinkpad X60 should have two cores, but I
> > >>only see one on 4.10-rc1. This machine went through many
> > >>suspend/resume cycles. When backups finish, I'll try -rc2.
> > >Whoever did it, he seems to have returned the cpu in -rc3. All seems
> > >to be good now.
> 
> > Actually since you have mentioned - I have checked my x60 - same problem -
> > only one CPU. However I was running 4.8.13 with uptime 33 days, multiple
> > sleep/wake-ups.
> > Installed a current EOL 4.8.17 and rebooted - I see 2 CPUs. So the issue is
> > older then 4.10 kernel, and I suspect it is the CPU hotplug / wakeup
> > related...
> 
> Hmm. So I seen two cores in -rc3 after boot. But it is quite well
> possible that -rc1 was ok just after boot, too, and problem happened
> sometime later (probably during suspend/resume cycles). Let me go back
> to -rc1 to check.

Indeed in -rc1 I see both CPUs after boot. So we have hard to
reproduce case where 4.8 to 4.10 kernels lose one of the cpu cores...



-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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