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Re: Question about migration of a VM between hosts having slight differe
Re: Question about migration of a VM between hosts having slight difference in TSC Frequency
Thu, 17 Dec 2020 17:17:24 +0100
On Thu, 17 Dec 2020 14:04:03 +0200
Veselina Radeva <email@example.com> wrote:
> I'm trying to migrate a VM from one host to another where there is a 1KHz
> difference in the TSC frequency between hosts. This results in errors
> caused by this warning
> so migration fails. On the other hand, I can see few lines before that
> there is a try to allow TSC frequency difference between host and VM if it
> falls within the specified bounds. It seems like `KVM_SET_TSC_KHZ`succeeds
> only when TSC Scaling is available
> Practically this means that migration between hosts having difference in
> TSC frequency, even when it falls within bounds, is possible only when TSC
> scaling is available.
> On the other hand, in libvirt,
> is allowed if TSC frequency difference falls within bounds, no matter if
> TSC scaling is enabled or not.
> So, I was wondering is it intended not to allow migration between hosts
> having differences in TSC frequency if TSC scaling is not available? Or is
> it a bug?
> Thanks in advance,
> Veselina Radeva
AFAIK, this is just a warning. I get it too and migration works fine here. How
exactly is migration failing for you?
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