Red Hat Bugzilla – Bug 146480
kernel time source instable
Last modified: 2015-01-04 17:16:21 EST
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
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
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.
We have the same error messages on our HP Proliant 360 running RHEL4-x86_64.
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'.
I can confirm this bug on FC4 and filed a new bug against FC4.
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.