Bug 16460

Summary:	Clocksource tsc unstable
Product:	Mageia	Reporter:	Matthieu Duchemin <alkahan>
Component:	RPM Packages	Assignee:	Kernel and Drivers maintainers <kernel>
Status:	RESOLVED OLD	QA Contact:
Severity:	normal
Priority:	Normal	CC:	marja11, thierry.vignaud
Version:	5	Keywords:	NEEDINFO
Target Milestone:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Source RPM:	kernel	CVE:
Status comment:
Bug Depends on:	16655
Bug Blocks:

Description Matthieu Duchemin 2015-07-23 22:24:21 CEST

Description of problem:

The kernel switch from tsc to refined-jiffies during boot.

Jul 21 08:40:35 localhost kernel: Clocksource tsc unstable (delta = 133764044 ns)
Jul 21 08:40:35 localhost kernel: Switched to clocksource refined-jiffies


with refined-jiffies, system clock is really slow, 4-5 times slower than real time.

I can switch back to tsc with 
echo tsc > /sys/devices/system/clocksource/clocksource0/current_clocksource

But tht system freeze ramdomly.

My hardware is a Baytrail based HP Pavilion x2 - 10-k020nf.

Tested with:
- kernel-desktop586-3.19.8-1.mga5-1-1
- kernel-tmb-desktop-3.19.8-1.mga5-1-1
- kernel-linus-3.19.8-2.mga5-1-1

I have tested Ubuntu 14.10 and the problem does not occur.



Reproducible: 

Steps to Reproduce:

David Walser 2015-07-30 18:16:34 CEST

Assignee: bugsquad => tmb
Source RPM: (none) => kernel

Comment 1 Thomas Backlund 2015-09-18 15:17:21 CEST

is 4.1.7 in testing working any better ?

Depends on: (none) => 16655

Comment 2 Matthieu Duchemin 2015-09-21 22:20:32 CEST

tested with 4.1.8-1

Same problem. The clocksource siwtched to refined-jiffies and the clock is still slow.

kernel: timekeeping watchdog: Marking clocksource 'tsc' as unstable, because the skew is too large: 
kernel:         'refined-jiffies' wd_now: fffbf891 wd_last: fffbf69c mask: ffffffff
kernel:         'tsc' cs_now: 1a9335e0f0 cs_last: 1a6675c050 mask: ffffffffff
kernel: Switched to clocksource refined-jiffies

Comment 3 Marja Van Waes 2016-08-26 11:43:23 CEST

Mass-reassigning all bugs with "kernel" in the Source RPM field that are assigned to tmb, to the kernel packagers group, because tmb is currently MIA.

Assignee: tmb => kernel

Comment 4 Thierry Vignaud 2016-10-05 07:48:50 CEST

What about newer kernels?

Keywords: (none) => NEEDINFO
CC: (none) => thierry.vignaud

Comment 5 Marja Van Waes 2018-04-29 09:50:51 CEST

(In reply to Thierry Vignaud from comment #4)
> What about newer kernels?

It's 2½ years later, still no reply.

Closing as OLD.

CC: (none) => marja11
Status: NEW => RESOLVED
Resolution: (none) => OLD

Comment 6 Marja Van Waes 2018-04-29 09:51:25 CEST

s/2½/1½/