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 Friday, November 09, 2007
/usepmtimer AMD systems

SYMPTOMS
In Microsoft Windows Server 2003 and in Microsoft Windows XP, a program that uses the QueryPerformanceCounter function to query system time may perform poorly. For example, if you run the ping command at the command prompt, you may receive low or incorrect latency values.

Note This problem occurs on computers that are running an x64-based version of Windows or an x86-based (32-bit) version of Windows.

RESOLUTION
To resolve this problem, update the BIOS on the computer. Or, modify the Boot.ini file to use the /usepmtimer switch. To do this, follow these steps: 1. Log on to the computer by using an account that has administrative credentials.
2. Click Start, click Run, type notepad c:\boot.ini, and then click OK. 
3. In the Boot.ini file, a line that starts with "default" is located in the "[boot loader]" section. This line specifies the location of the default operating system. The line may appear as follows:
default=multi(0)disk(0)rdisk(0)partition(2)\WINDOWS
In the "[operating systems]" section, locate the line for the operating system that corresponds to the "default" line. For example, if the computer is running Microsoft Windows Server 2003, Enterprise x64 Edition, the line should resemble the following:
multi(0)disk(0)rdisk(0)partition(2)\WINDOWS="Windows Server 2003 Enterprise x64 Edition" /fastdetect /NoExecute=OptIn
4. At the end of the line, add a space, and then type /usepmtimer. The line should now resemble the following.
multi(0)disk(0)rdisk(0)partition(2)\WINDOWS="Windows Server 2003 Enterprise x64 Edition" /fastdetect /NoExecute=OptIn /usepmtimer
5. Save the file, and then exit Notepad.
6. Restart the computer.


The following is a sample Boot.ini file for a system that contains the /usepmtimer switch.
[boot loader]
timeout=0
default=multi(0)disk(0)rdisk(0)partition(2)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(2)\WINDOWS="Windows Server 2003 Enterprise x64 Edition" /fastdetect /NoExecute=OptIn /usepmtimer

MS KB articles

http://support.microsoft.com/kb/833721    http://support.microsoft.com/kb/895980/

Software
11/9/2007 5:23:43 AM (Pacific Standard Time, UTC-08:00)  #    Disclaimer  |  Comments [0]  | 
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