Bug 121383 - Severe time drift with SMP kernel
Severe time drift with SMP kernel
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
i686 Linux
medium Severity medium
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Assigned To: Arjan van de Ven
Brian Brock
Depends On:
  Show dependency treegraph
Reported: 2004-04-20 18:50 EDT by Alejandro Mota
Modified: 2007-11-30 17:10 EST (History)
1 user (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2004-05-15 19:31:58 EDT
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Regression: ---
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Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
Default SMP boot log. (16.58 KB, text/plain)
2004-05-03 15:51 EDT, Alejandro Mota
no flags Details
Default SMP boot log. (16.58 KB, text/plain)
2004-05-03 15:54 EDT, Alejandro Mota
no flags Details

  None (edit)
Description Alejandro Mota 2004-04-20 18:50:06 EDT
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6)
Gecko/20040211 Firefox/0.8

Description of problem:
When using the SMP kernel on a Pentium 4 HT machine,
a severe time drift around 1/2 hour per day happens.
The drift increases significantly when running any application that
uses alsa, to around 5-10 minutes per hour. In both cases the clock
runs faster than normal.

This drift does not happen with the UP kernel.

Version-Release number of selected component (if applicable):
at least kernel-smp-2.6.4-1.300 to kernel-smp-2.6.5-1.332

How reproducible:

Steps to Reproduce:
1. Boot with SMP kernel
2. Do nothing or run any program.
3. Using programs that require ALSA increases drift.

Actual Results:  Drift is quickly apparent by comparing the clock with
an accurate clock.

Expected Results:  Clock should be accurate withing milliseconds, as
it happens with the UP kernel.

Additional info:

This problem did not occur with the 2.4 kernels, both UP and SMP.

Machine is a Sager 5690 notebook, Pentium 4 HT 3.2 GHz, Intel
i865PE+ICH5 chipset, Intel 82801EB/ER AC'97 audio.
Comment 1 Alan Cox 2004-05-02 20:06:00 EDT
Does the option "acpi=off" make a difference here. Also can you attach
your boot up log of the problem system.
Comment 2 Arjan van de Ven 2004-05-03 06:09:06 EDT
Could well be a victim of the HZ=1000 stuff in 2.6
Are you running ntp ?
Comment 3 Alejandro Mota 2004-05-03 15:51:52 EDT
Created attachment 99924 [details]
Default SMP boot log.
Comment 4 Alejandro Mota 2004-05-03 15:54:28 EDT
Created attachment 99925 [details]
Default SMP boot log.

When I boot the machine with acpi=off, the kernel starts to boot, then it
prints the following messages:

ACPI: ACPI tables contain no PCI IRQ routing entries
PCI: Invalid ACPI-PCI IRQ routing table

and then it hard locks.

If I pass the option noapic to the kernel, it seems to work fine. I haven't
tried pci=noapic, which is an option I saw in an LKML email.

The situation happens regardless of whether I use NTP or not.

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