Re: [Xen-devel] [PATCH v3] new config option vtsc_tolerance_khz to avoid TSC emulation

[Olaf Hering <olaf@xxxxxxxxx>]

So, how do we address the performance regression fixed by this patch?

Olaf

Am Mon, 12 Mar 2018 10:15:08 +0100
schrieb Olaf Hering <olaf@xxxxxxxxx>:

> Am Tue, 6 Mar 2018 11:07:54 +0000
> schrieb Andrew Cooper <andrew.cooper3@xxxxxxxxxx>:
> 
> > > Add a new domctl XEN_DOMCTL_set_vtsc_tolerance_khz to adjust the
> > > tolerance value of a running domU that is supposed to be migrated.    
> > Please can we not proliferate the domctls.
> > This looks like it should be part of the set_tsc_info hypercall, not a
> > separate hypercall.  
> 
> How should this approach be implemented? To me it looks like set_tsc_info
> should be called only once for a not-yet-active domU, but I'm not familiar
> with timekeeping.
> If it can be just called once, and there should be a way to adjust the 
> tolerance value, then XEN_DOMCTL_settscinfo would need to be changed to 
> have subcommands.

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