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[ILUG] Timekeeping in virtual machines

[ILUG] Timekeeping in virtual machines

Brendan Minish bminish at minish.org
Sun Apr 6 20:28:24 IST 2008


On Thu, 2008-04-03 at 11:22 +0100, Conor Wynne wrote:

> 
> Novell/SUSE use config HZ=250 in their kernels (AFAIR) and you just need to
> re-compile it with HZ=100.
> Problem solved. Or was that the other way around, cannot remember as it was
> ages ago. Check the kernel sources my friend.

This tip may not always solve the issue but it's good advice when
compiling kernels for virtual machines in any case.

with redhat (& Centos ) guests the following two things have worked for
me every time. Your mileage with other distros may vary.. 

1/ clock=pit in the kernel options in grub 
2/ ensure that the cpuspeed daemon is not started at boot or running on
the guest.

With centos / RHEL guests I have 100% success when both are done, you
can then use the vmware server option
tools.syncTime = "TRUE" 
or you can use ntpd running on the guest

But don't use both or ntpd will get upset about the jumps that vmware
will cause from time to time and the ntpd process will die


Conor, I think we meet in the morning as I suspect you are also doing
the RH300 this week.. 

Regards
Brendan Minish




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