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Date:      Tue, 02 Jan 2018 14:41:37 -0800
From:      "Chris H" <bsd-lists@BSDforge.com>
To:        "Gary Palmer" <gpalmer@freebsd.org>
Cc:        <freebsd-stable@freebsd.org>, "Konstantin Belousov" <kostikbel@gmail.com>
Subject:   Re: Odd behaviour on recent boot of 11.1 with timecounters
Message-ID:  <d4038b352a7522765c4b34cd9f76ddee@udns.ultimatedns.net>
In-Reply-To: <20180102164526.GA63396@in-addr.com>

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On Tue, 2 Jan 2018 16:45:26 +0000 "Gary Palmer" <gpalmer@freebsd=2Eorg> said

> On Sun, Dec 31, 2017 at 06:47:38PM +0200, Konstantin Belousov wrote:
> > On Sun, Dec 31, 2017 at 03:49:13PM +0000, Gary Palmer wrote:
> > > On Sun, Dec 31, 2017 at 04:51:47PM +0200, Konstantin Belousov wrote:
> > > > On Sun, Dec 31, 2017 at 02:17:08PM +0000, Gary Palmer wrote:
> > > > >=20
> > > > > Hi,
> > > > >=20
> > > > > I recently updated to 11=2E1-RELEASE-p6 and on the most recent rebo=
ot=20
> > > > > (after rebuilding all the necessary packages) the clock was runni=
ng=20
> > > > > slow and NTP wouldn't sync=2E  I looked in /var/log/messages and I =
found
> > > > > that for some reason, on this latest boot, it got the frequency o=
f
> > > > > TSC-low wrong=2E
> > > > >=20
> > > > > Aug 24 04:55:35 my kernel: Timecounter "TSC-low" frequency 174607=
3190
> > Hz quality 1000
> > > > > Aug 26 03:11:38 my kernel: Timecounter "TSC-low" frequency 174607=
0760
> > Hz quality 1000
> > > > > Aug 26 14:12:46 my kernel: Timecounter "TSC-low" frequency 174607=
5204
> > Hz quality 1000
> > > > > Nov 19 16:01:09 my kernel: Timecounter "TSC-low" frequency 174607=
0746
> > Hz quality 1000
> > > > > Dec 27 22:28:00 my kernel: Timecounter "TSC-low" frequency 174607=
4808
> > Hz quality 1000
> > > > > Dec 27 22:51:12 my kernel: Timecounter "TSC-low" frequency 174607=
1892
> > Hz quality 1000
> > > > > Dec 28 12:50:46 my kernel: Timecounter "TSC-low" frequency 174606=
9704
> > Hz quality 1000
> > > > > Dec 28 14:03:52 my kernel: Timecounter "TSC-low" frequency 193787=
6448
> > Hz quality 1000
> > > > >=20
> > > > > Until the December reboots the machine was running 10=2Ex=2E  Dec 27 =
and
> > later
> > > > > are part of the process to get up to 11=2Ex=2E
> > > > >=20
> > > > > Any idea why the TSC-low frequency jumped 191,806,744Hz on the la=
st
> > > > > measurement?
> > > > >=20
> > > > > I switched to HPET temporarily via sysctl and ntp seems happy=2E  I=
'm
> > just
> > > > > concerned that the problem might recur on later reboots as TSC-lo=
w
> > seems
> > > > > to be the preferred timecounter=2E
> > > >=20
> > > > Show first 100 lines of the dmesg from a verbose boot=2E
> > > > Also check BIOS settings related to overclocking and powersaving=2E
> > > >=20
> > >=20
> > > Hi Konstantin,
> > >=20
> > > BIOS settings haven't been changed in 4+ years=2E  No overclocking, and
> > > all powersaving options are at "auto" or "disabled"=2E
> > >=20
> > > The first 100 lines of verbose dmesg didn't seem that interesting so
> > > I've included up to the end of "Device configuration finished"
> > >=20
> > > Note that this boot didn't have the TSC-low problem, and the boot
> > > that had it wasn't verbose unfortunately=2E
> >=20
> > It is really the CPU identification which I wanted to see=2E  You have
> > IvyBridge, which is known to have good TSC=2E
>=20
> Ah
>=20
> > Try to obtain verbose dmesg with mis-identified frequency=2E
>=20
> Tried, and failed after 20+ reboots=2E  I've left
>=20
> boot_verbose=3D" -v"
I believe that should read:

boot_verbose=3D"YES"
but maybe just the occurrence of something makes it a positive=2E

>=20
> in /boot/loader=2Econf to catch any boot-time wonkiness and undone it at
> runtime with=20
>=20
> debug=2Ebootverbose=3D0
>=20
> in /etc/sysctl=2Econf as I found that the snd_hda driver is =2E=2E=2E chatty
> at runtime=2E
>=20
> Thanks,
>=20
> Gary
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