Bug 665197 - WARNING: APIC timer calibration may be wrong
Summary: WARNING: APIC timer calibration may be wrong
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: kernel
Version: 5.4
Hardware: All
OS: Linux
high
medium
Target Milestone: rc
: ---
Assignee: Prarit Bhargava
QA Contact: Chao Ye
URL:
Whiteboard:
Depends On: 562006
Blocks: 680350
TreeView+ depends on / blocked
 
Reported: 2010-12-23 03:50 UTC by Subhendu Ghosh
Modified: 2016-10-04 04:30 UTC (History)
12 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Prior to this update, the following message was displayed when booting a Red Hat Enterprise Linux 5 system on a virtual guest: WARNING calibrate_APIC_clock: the APIC timer calibration may be wrong. This was due to the MAX_DIFFERENCE parameter value (in the APIC calibration loop) of 1000 cycles being too aggressive for virtual guests. APIC (Advanced Programmable Interrupt Controllers) and TSC (Time Stamp Counter) reads normally take longer than 1000 cycles when performed from inside a virtual guest, due to processors being scheduled away from and then back onto the guest. With this update, the MAX_DIFFERENCE parameter value has been increased to 10,000 for virtual guests.
Clone Of: 562006
Environment:
Last Closed: 2011-07-21 09:40:25 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2011:1065 0 normal SHIPPED_LIVE Important: Red Hat Enterprise Linux 5.7 kernel security and bug fix update 2011-07-21 09:21:37 UTC

Comment 5 Jarod Wilson 2011-03-03 20:33:56 UTC 
in kernel-2.6.18-246.el5
You can download this test kernel (or newer) from http://people.redhat.com/jwilson/el5

Detailed testing feedback is always welcomed.
Comment 7 Martin Prpič 2011-04-14 10:17:03 UTC 
    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
Prior to this update, the following message was displayed when booting a Red Hat Enterprise Linux 5 system on a virtual guest:

WARNING calibrate_APIC_clock: the APIC timer calibration may be wrong.

This was due to the MAX_DIFFERENCE parameter value (in the APIC calibration loop) of 1000 cycles being too aggressive for virtual guests. APIC (Advanced Programmable Interrupt Controllers) and TSC (Time Stamp Counter) reads normally take longer than 1000 cycles when performed from inside a virtual guest, due to processors being scheduled away from and then back onto the guest. With this update, the MAX_DIFFERENCE parameter value has been increased to 10,000 for virtual guests.
Comment 15 errata-xmlrpc 2011-07-21 09:40:25 UTC 
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2011-1065.html
Note You need to log in before you can comment on or make changes to this bug.