[CentOS-virt] Fast clock under VMWare
Ray Van Dolson
rvandolson at esri.com
Fri Feb 22 17:20:12 UTC 2008
On Fri, Feb 22, 2008 at 12:12:59PM -0500, 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?
I think the typical fix for the clock-too-fast problem is to boot your
guest OS with the clock=pit option and then use the VMware Tools time
If the clock is running too slow is where you want to look into using
one of the 100Hz kernels.
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