From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750978AbdAOJ5A (ORCPT ); Sun, 15 Jan 2017 04:57:00 -0500 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:60526 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750809AbdAOJ47 (ORCPT ); Sun, 15 Jan 2017 04:56:59 -0500 Date: Sun, 15 Jan 2017 10:56:56 +0100 From: Pavel Machek To: Woody Suwalski , "Rafael J. Wysocki" Cc: kernel list , tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com Subject: Re: 4.10-rc1: thinkpad x60: who ate my cpu? Message-ID: <20170115095656.GA16524@amd> References: <20170108221721.GB4878@amd> <20170109093001.GA30709@amd> <41553b16-c527-d99b-b56b-31d6a08a7e8a@gmail.com> <20170114113054.GA22012@amd> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="bg08WKrSYDhXBjb5" Content-Disposition: inline In-Reply-To: <20170114113054.GA22012@amd> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --bg08WKrSYDhXBjb5 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat 2017-01-14 12:30:54, Pavel Machek wrote: > Hi! >=20 > 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. >=20 > > Actually since you have mentioned - I have checked my x60 - same proble= m - > > 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 issu= e is > > older then 4.10 kernel, and I suspect it is the CPU hotplug / wakeup > > related... >=20 > 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... --=20 (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo= g.html --bg08WKrSYDhXBjb5 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEARECAAYFAlh7R2gACgkQMOfwapXb+vL4rQCaA2ggVdZlUoYlG5vuo5fdHlrQ MOwAmgNbQGwDvLKsKzHCtMNwGtCBw2Yn =OOci -----END PGP SIGNATURE----- --bg08WKrSYDhXBjb5--