[CentOS-virt] Fwd: Fast clock under VMWare

Ross S. W. Walker rwalker at medallion.com
Tue Feb 26 21:13:46 UTC 2008

chanms wrote:
> Hi everyone,
> I have been struggling with having the clock of Linux VM's (including
> CentOS 4.6 and 5.1) running very fast under VMWare, no matter what I
> have tried.
> My platform:
> - AMD Turion X2 TL-60
> - AMD 690 chipset with integrated Radeon x1250 (probably doesn't
> concern in this case)
> - Windows Vista Ultimate x64, all Windows Update patches 
> loaded (no SP1 yet)
> - 4GB RAM
> - VMWare Workstation 6.0.2
> - BIOS has no options to disable power management, etc.
> On my host PC
> - C:\ProgramData\VMware\VMware Workstation\Config.ini, put in
> host.cpukHz = "2000000", host.noTSC = "TRUE", ptsc.noTSC = "TRUE"
> - AMD's dual core optimizer loaded
> On CentOS 5.1 VM
> - use kernel options "noapic nolapic nosmp clocksource=acpi_pm"
> - use "divider=10" option in the regular kernel
> - try the vm version of the kernel in centos-plus with the same kernel
> options in first line
> No matter what I try, the CentOS clocks are still fast - at a rate of
> almost 2 seconds for every 1 real second.
> What other things I can do in order to fix this?

Did you try the 100Hz kernels in testing?


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