Re: [Xen-devel] [PATCH RFC] handle tsc_tolerance during migration between identical hosts

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 18.04.17 at 11:50, <olaf@xxxxxxxxx> wrote:
> On Tue, Apr 11, Jan Beulich wrote:
> 
>> I'm afraid successful testing is not a sufficient criteria here. At
>> the very least the (so far missing) documentation needs to very
>> clearly point out the possible risks associated with using this
>> option. But with there not being any functional change when
>> the option is not being made use of, I don't think there's a
>> reason not to add this (for the adventurous).
> 
> This can be handled by refering to the documentation of
> 'tsc_mode=native', which is what this change actually does.

Does it? I've just looked at th patch again, and I didn't find any
such referral. Are you perhaps talking about some change you
only have done locally?

>> What I'm not sure about is whether having this as a global
>> (instead of per-guest) setting is really all that useful: As
>> different guests may require different tolerance, having a
>> single unique setting may not allow people to get very far.
> 
> Another change on top of this, which adds a per-domU knob, could be
> added. This also requires a decision if the per-domU or the global knob
> has higher priority.

This latter aspect is why I'd like to avoid having both.

Jan


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