Mailinglist Archive: opensuse (4626 mails)

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Re: [opensuse] Re: Timesync problem
  • From: Verner Kjærsgaard <vk@xxxxxxxxxxxxx>
  • Date: Tue, 16 Jan 2007 10:14:43 +0100
  • Message-id: <200701161014.43931.vk@xxxxxxxxxxxxx>
Tirsdag 16 januar 2007 02:53 skrev John Andersen:
> On Monday 15 January 2007 16:16, Joachim Schrod wrote:
> > AFAIK, this happens if your host system is an SMP system (i.e., with
> > multiple CPUs) and your guest system is configured as a
> > single-processor CPU. The VMware instance seems to see only half of
> > the jiffies on a 2-CPU system, or something like that.
> >
> > I don't know a way to resolve it short of configuring the VMware
> > instance to use several CPUs as well.
>
> Configuring guests with multiple CPUs probably won't help. It often
> makes it worse to the point of being unusable.
>
> To further pin this down, its only happens on multi-processor
> smp systems where the individual processors to not keep
> their timestamp counters (TSCs) in sync, such as some AMD machines
> and Core 2 Duo processors.
>
> You can prevent any problem by restricting a guest machine to a single cpu
> rather than allowing it to bounce around from cpu to cpu.
>
> You can do this like this
>
> 1 Make sure the virtual machine is powered off.
> 2 In a text editor, open the virtual machine's configuration file (.vmx
> file). 3 Add the following line for each processor with which you do not
> want to associate the virtual machine (where <n> is the number of the
> processor on the host):
> processor<n>.use = FALSE
>
> So for your first Virtual machine you might put in:
> processor0.use = FALSE
> and your second virtual machine you would put:
> processor1.use = FALSE
>
> That allows VMware to run using both processors, but the actual virtual
> machine itself is using only one or the other.
>
> You an also use taskset to restrict all of vmware to a single cpu.
>
> http://kb.vmware.com/KanisaPlatform/Publishing/316/2039_f.SAL_Public.html

Thank You!

- as we cannot power down the affected system right now, we can't give it a
shot until later today.

- but your solutions sound very plausible, we'll keep the list posted!



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Med venlig hilsen/Best regards
Verner Kjærsgaard

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