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

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Date:   Sun, 15 Jan 2017 10:56:56 +0100
From:   Pavel Machek <pavel@....cz>
To:     Woody Suwalski <terraluna977@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     kernel list <linux-kernel@...r.kernel.org>, tglx@...utronix.de,
        mingo@...hat.com, hpa@...or.com
Subject: Re: 4.10-rc1: thinkpad x60: who ate my cpu?

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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