On 03/18/2010 07:33 PM, Mark Cranness wrote: > On 19 March 2010 10:05, JD wrote: > >> ... >> > I just now had a host CPU issue that I fixed. > With guest CPU near 0%, the host was showing CPU ~25% > > It turned out to be that SqlServer 2005 calling a Windows function to > increase the 'PM' timer resolution to 1ms, which causes VirtualBox to > eat host CPU cycles. > > This was visible in the VBox.log as: > 00:16:07.848 PIT: mode=2 count=0x4ad (1197) - 996.81 Hz (ch=0) > > For SqlServer there are a couple of fixes: > 1) Set a SqlServer Startup Options Trace Flag that stops SqlServer > using 1ms timer resolution: > http://social.technet.microsoft.com/Forums/en/windowsserver2008r2virtualization/thread/ec6b08d0-abfd-4e43-8c53-e1cd262fd416 > > 2) Install Cumulative Hotfix 5 or greater, which also stops SqlServer > using 1ms timer resolution: > http://support.microsoft.com/kb/972767/ > > Similar problems and fixes apply to SqlServer 2008 also. > > If other programs are using a 1ms timer, the fix will be different and > program specific. > > Mark > > That's a great find!! Thanx. Problem with me is I am not using SqlServer at all. Is it something that is installed by default and runs invisible in the background?
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