Red Hat Bugzilla – 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]
Last modified: 2015-05-04 21:20:11 EDT
This bug has been copied from bug #579711 and has been proposed
to be backported to 5.5 z-stream (EUS).
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.
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.
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.