Difference between revisions of "Guest Time drift"

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Some tips if you have time drifts (mainly for windows)
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Some tips from [http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Virtualization_Host_Configuration_and_Guest_Installation_Guide/chap-Virtualization_Host_Configuration_and_Guest_Installation_Guide-KVM_guest_timing_management.html RedHat's Virtualization Host Configuration and Guest Installation Guide], if you have time drifts (mainly for windows),
  
http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Virtualization_Host_Configuration_and_Guest_Installation_Guide/chap-Virtualization_Host_Configuration_and_Guest_Installation_Guide-KVM_guest_timing_management.html
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== Using the Real-Time Clock ==
 
 
 
 
==WIN XP - WIN2003==
 
 
 
Using the Real-Time Clock with Windows Server 2003 and Windows XP guests
 
  
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=== WIN XP, WIN 2003 Server ===
  
 
Windows uses the both the Real-Time Clock (RTC) and the Time Stamp Counter (TSC).  
 
Windows uses the both the Real-Time Clock (RTC) and the Time Stamp Counter (TSC).  
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To enable the RTC for the PMTIMER clock source (usually uses the TSC), add the option '''/usepmtimer''' to the end of the boot line in '''boot.ini'''.
 
To enable the RTC for the PMTIMER clock source (usually uses the TSC), add the option '''/usepmtimer''' to the end of the boot line in '''boot.ini'''.
  
==WIN VISTA - WIN7 - WIN2008==
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===WIN Vista, WIN7, WIN2008 Server===
 
 
  
 
In your windows guest:
 
In your windows guest:

Revision as of 02:10, 17 October 2013

Some tips from RedHat's Virtualization Host Configuration and Guest Installation Guide, if you have time drifts (mainly for windows),

Using the Real-Time Clock

WIN XP, WIN 2003 Server

Windows uses the both the Real-Time Clock (RTC) and the Time Stamp Counter (TSC).

For Windows guests the RTC can be used instead of the TSC for all time sources, which resolves guest timing issues.

To enable the RTC for the PMTIMER clock source (usually uses the TSC), add the option /usepmtimer to the end of the boot line in boot.ini.

WIN Vista, WIN7, WIN2008 Server

In your windows guest:

C:\Windows\system32>bcdedit /set {default} USEPLATFORMCLOCK on