I am running PRTG on a server with AMD processor (real hardware). Why do I get negative Ping values for my Ping sensors?


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Time Stamp Counter Drift

Dual Core or multiprocessor AMD Opteron processors may encounter Time Stamp Counter (TSC) drift in certain conditions.

To solve this problem, please see the following quotation from technet.com:

Edit the BOOT.ini file and add the parameter "/usepmtimer", then reboot the server. Adding the "/usepmtimer" parameter to the BOOT.INI file configures the Windows operating system to use the PM_TIMER, rather than the Time Stamp Counter.

Note: When installing the latest AMD PowerNow! Technology driver from AMD, the BOOT.INI file will automatically be updated with the “/usepmtimer” parameter. While the driver itself does not resolve this issue, the installation process will make the necessary changes to the BOOT.INI file to prevent the issue from occurring.

For detailed information, please see Explanation for the USEPMTIMER switch in the boot.ini

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Apr, 2011 - Permalink