Bug 660239 - clock drift when migrating a guest between mis-matched CPU clock speed
clock drift when migrating a guest between mis-matched CPU clock speed
Status: CLOSED ERRATA
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: kvm (Show other bugs)
5.5.z
Unspecified Unspecified
urgent Severity urgent
: rc
: ---
Assigned To: Virtualization Maintenance
Virtualization Bugs
: ZStream
Depends On: 655990
Blocks: 556823 Rhel5KvmTier2
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Reported: 2010-12-06 03:22 EST by RHEL Product and Program Management
Modified: 2013-01-09 18:24 EST (History)
16 users (show)

See Also:
Fixed In Version: kvm-83-164.el5_5.28
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Environment:
Last Closed: 2010-12-20 12:37:10 EST
Type: ---
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CRM:
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---


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Description RHEL Product and Program Management 2010-12-06 03:22:15 EST
This bug has been copied from bug #655990 and has been proposed
to be backported to 5.5 z-stream (EUS).
Comment 9 Xiaoli Tian 2010-12-13 21:31:43 EST
It has been verified on AMD host with kernel-2.6.18-194.26.1.el5 with kvm-83-164.el5_5.29

the result is as following:
ntpdate -q clock.redhat.com
server 66.187.233.4, stratum 1, offset 1.878373, delay 0.29205
14 Dec 09:26:15 ntpdate2601: step time server 66.187.233.4 offset 1.878373 sec
ntpdate -q clock.redhat.com
server 66.187.233.4, stratum 1, offset 1.879503, delay 0.29243
14 Dec 09:26:22 ntpdate2602: step time server 66.187.233.4 offset 1.879503 sec
ntpdate -q clock.redhat.com
server 66.187.233.4, stratum 1, offset 1.879385, delay 0.28969
14 Dec 09:26:38 ntpdate2603: step time server 66.187.233.4 offset 1.879385 sec
ntpdate -q clock.redhat.com
server 66.187.233.4, stratum 1, offset 1.849693, delay 0.27289
14 Dec 09:30:29 ntpdate2610: step time server 66.187.233.4 offset 1.849693 sec
ntpdate -q clock.redhat.com
server 66.187.233.4, stratum 1, offset 1.837023, delay 0.27748
14 Dec 09:32:33 ntpdate2615: step time server 66.187.233.4 offset 1.837023 sec
ntpdate -q clock.redhat.com
server 66.187.233.4, stratum 1, offset 1.829853, delay 0.27637
14 Dec 09:34:21 ntpdate2619: step time server 66.187.233.4 offset 1.829853 sec
vi ntpdate.result
ntpdate -q clock.redhat.com
server 66.187.233.4, stratum 1, offset 1.774460, delay 0.30309
Comment 10 Mike Cao 2010-12-13 21:53:23 EST
On Intel host with different TSC rate ,Verified on
# uname -r
2.6.18-194.30.1.el5
# rpm -q kvm
kvm-83-164.el5_5.29

Actual Results:
No time shift after migration.

Base on above and comment #9, this issue has been fixed ald.
Comment 13 errata-xmlrpc 2010-12-20 12:37:10 EST
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-2010-0998.html

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