Bug 146480 - kernel time source instable
Summary: kernel time source instable
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: 3
Hardware: x86_64
OS: Linux
Target Milestone: ---
Assignee: Dave Jones
QA Contact: Brian Brock
Depends On:
TreeView+ depends on / blocked
Reported: 2005-01-28 19:06 UTC by Chris Ricker
Modified: 2015-01-04 22:16 UTC (History)
4 users (show)

Clone Of:
Last Closed: 2005-10-03 00:11:35 UTC

Attachments (Terms of Use)

External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Bugzilla 168053 None None None Never

Internal Trackers: 168053

Description Chris Ricker 2005-01-28 19:06:31 UTC
I've got two identical Dell PowerEdge 2850s here running FC3 x86_64
that produce time source errors. With the 2.6.10-1.741_FC3smp kernel,
these two boxes both say:

Losing some ticks... checking if CPU frequency changed.
warning: many lost ticks.
Your time source seems to be instable or some driver is hogging interupts
rip _spin_unlock_irqrestore+0x2d/0x2e
Falling back to HPET

Modules loaded are:

Module                  Size  Used by
i2c_dev                13633  0 
i2c_core               27201  1 i2c_dev
video                  20041  0 
button                  9057  0 
battery                12105  0 
ac                      6729  0 
uhci_hcd               35433  0 
ehci_hcd               35401  0 
hw_random               7137  0 
e1000                  96021  0 
floppy                 65425  0 
sg                     42873  0 
dm_snapshot            18561  0 
dm_zero                 3649  0 
dm_mirror              24401  2 
ext3                  137297  2 
jbd                    66545  1 ext3
dm_mod                 65537  6 dm_snapshot,dm_zero,dm_mirror
megaraid_mbox          35409  2 
megaraid_mm            13185  1 megaraid_mbox
sd_mod                 19393  3 
scsi_mod              140409  3 sg,megaraid_mbox,sd_mod

These machines both have 2 real (4 virtual) 2.8GHz Xeons

Comment 1 Chris Ricker 2005-01-28 19:28:42 UTC
Other dual (4 virtual) 2850s here running that same kernel don't show
this. The only hardware difference is that the 2 boxes showing this
message have a Intel e1000 PCI card added (in addition to the 2
on-board e1000s built in on the 2850s)

the onboard are:
06:07.0 Ethernet controller: Intel Corp. 82541GI/PI Gigabit Ethernet
Controller (rev 05)
07:08.0 Ethernet controller: Intel Corp. 82541GI/PI Gigabit Ethernet
Controller (rev 05)

the pci card is:
09:04.0 Ethernet controller: Intel Corp. 82543GC Gigabit Ethernet
Controller (Copper) (rev 02)

In addition, the 2 boxes showing this message are using LVM, which our
other 2850s are not

Those are the only hardware / driver differences between the 2 boxes
which display this and the multiple ones which don't.

Comment 2 EE CAP Admin 2005-06-07 12:30:39 UTC
We have the same error messages on our HP Proliant 360 running RHEL4-x86_64. 
Many thanks.

Comment 3 Dave Jones 2005-07-15 17:43:52 UTC
An update has been released for Fedora Core 3 (kernel-2.6.12-1.1372_FC3) which
may contain a fix for your problem.   Please update to this new kernel, and
report whether or not it fixes your problem.

If you have updated to Fedora Core 4 since this bug was opened, and the problem
still occurs with the latest updates for that release, please change the version
field of this bug to 'fc4'.

Thank you.

Comment 4 Thomas Antony 2005-09-11 20:17:00 UTC
I can confirm this bug on FC4 and filed a new bug against FC4.

Comment 5 Dave Jones 2005-10-03 00:11:35 UTC
This bug has been automatically closed as part of a mass update.
It had been in NEEDINFO state since July 2005.
If this bug still exists in current errata kernels, please reopen this bug.

There are a large number of inactive bugs in the database, and this is the only
way to purge them.

Thank you.

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