Bug 665197
| Summary: | WARNING: APIC timer calibration may be wrong | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 5 | Reporter: | Subhendu Ghosh <sghosh> |
| Component: | kernel | Assignee: | Prarit Bhargava <prarit> |
| Status: | CLOSED ERRATA | QA Contact: | Chao Ye <cye> |
| Severity: | medium | Docs Contact: | |
| Priority: | high | ||
| Version: | 5.4 | CC: | akataria, chyang, cye, czhang, dhoward, drjones, garrett, ghelleks, jsavanyo, jwilson, prarit, qcai |
| Target Milestone: | rc | Keywords: | Regression, ZStream |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| 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.
|
Story Points: | --- |
| Clone Of: | 562006 | Environment: | |
| Last Closed: | 2011-07-21 09:40:25 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 562006 | ||
| Bug Blocks: | 680350 | ||
|
Comment 5
Jarod Wilson
2011-03-03 20:33:56 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.
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 |