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

From	Pavel Machek <pavel@ucw.cz>
Newsgroups	linux.kernel
Subject	Re: 4.10-rc1: thinkpad x60: who ate my cpu?
Date	2017-01-15 11:00 +0100
Message-ID	<sZPLr-YF-9@gated-at.bofh.it> (permalink)
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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...



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

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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

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