Bug 601090 - time drift due to incorrect accounting of lost ticks with VXTIME_PMTMR mode and VXTIME_TSC mode if 'tick_divider' > 1 [rhel-5.5.z]
time drift due to incorrect accounting of lost ticks with VXTIME_PMTMR mode a...
Status: CLOSED ERRATA
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: kernel (Show other bugs)
5.4.z
x86_64 Linux
urgent Severity medium
: rc
: ---
Assigned To: Jiri Pirko
Red Hat Kernel QE team
: ZStream
Depends On: 579711
Blocks:
  Show dependency treegraph
 
Reported: 2010-06-07 04:00 EDT by RHEL Product and Program Management
Modified: 2015-05-04 21:20 EDT (History)
10 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
The timer_interrupt() routine did not scale lost real ticks to logical ticks correctly. This could have caused time drift for 64-bit Red Hat Enterprise Linux 5: KVM (Kernel-based Virtual Machine) guests that were booted with the "divider=x" kernel parameter set to a value greater than 1. "warning: many lost ticks" messages may have been logged on the affected guest systems.
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Clone Of:
Environment:
Last Closed: 2010-07-01 14:29:00 EDT
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Regression: ---
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CRM:
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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 2010-06-07 04:00:43 EDT
This bug has been copied from bug #579711 and has been proposed
to be backported to 5.5 z-stream (EUS).
Comment 3 Jiri Pirko 2010-06-07 09:31:30 EDT
in 2.6.18-194.6.1.el5
Comment 8 Douglas Silas 2010-06-28 16:53:45 EDT
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:
The timer_interrupt() routine did not scale lost real ticks to logical ticks correctly. This could have caused time drift for 64-bit Red Hat Enterprise Linux 5: KVM (Kernel-based Virtual Machine) guests that were booted with the "divider=x" kernel parameter set to a value greater than 1. "warning: many lost ticks" messages may have been logged on the affected guest systems.
Comment 10 errata-xmlrpc 2010-07-01 14:29:00 EDT
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-2010-0504.html

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