Bug 562006
Summary: | WARNING: APIC timer calibration may be wrong | |||
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Product: | Red Hat Enterprise Linux 5 | Reporter: | Alok Kataria <akataria> | |
Component: | kernel | Assignee: | Prarit Bhargava <prarit> | |
Status: | CLOSED ERRATA | QA Contact: | Red Hat Kernel QE team <kernel-qe> | |
Severity: | medium | Docs Contact: | ||
Priority: | low | |||
Version: | 5.4 | CC: | drjones, garrett, jsavanyo, jwilson, pbhaskar, prarit, qcai | |
Target Milestone: | rc | Keywords: | Regression | |
Target Release: | --- | |||
Hardware: | All | |||
OS: | Linux | |||
Whiteboard: | ||||
Fixed In Version: | Doc Type: | Bug Fix | ||
Doc Text: | Story Points: | --- | ||
Clone Of: | ||||
: | 665197 (view as bug list) | Environment: | ||
Last Closed: | 2010-03-30 07:46:00 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: | ||||
Bug Blocks: | 665197 | |||
Attachments: |
Description
Alok Kataria
2010-02-04 23:22:36 UTC
Created attachment 388921 [details]
Proposed patch, which bumps the maximum difference value to 5000
5000 seems really long. I'll check with the virt team to see if there is a better way of handling this. P. Created attachment 389560 [details]
RHEL5 fix for this issue
Bump default value to 5000 cycles and add boot option.
This request was evaluated by Red Hat Product Management for inclusion in a Red Hat Enterprise Linux maintenance release. Product Management has requested further review of this request by Red Hat Engineering, for potential inclusion in a Red Hat Enterprise Linux Update release for currently deployed products. This request is not yet committed for inclusion in an Update release. 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-2010-0178.html Created attachment 470348 [details]
Bump apiccalibrationdiff to 10000 when running on VMware.
Some of our customers have complained about still seeing this warning.
After some analysis, we have noticed that on some AMD opteron processors, HV exits caused by RDTSC and APIC_READS can surpass the 5000 cycles limit.
Now, one can argue that those who are affected can use the apiccalibrationdiff boot parameter, though as an counter-argument to that people expect things to work okay (read without any warnings or such in dmesg) that too right out of the box.
Given the above I think we should just bump this value to somewhere around 10K so that this doesn't bother anyone. The attached patch does exactly that, though we do this just when running on VMware, so that it doesn't affect behavior in other cases.
Please consider this trivial patch for the next update. Thanks.
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