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 ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Vbox-users-community mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/vbox-users-community
