Re: [Xen-ia64-devel][PATCH] Enable SMP on VTI domain.

[Tristan Gingold <Tristan.Gingold@xxxxxxxx>]

Le Mercredi 31 Mai 2006 14:25, Xu, Anthony a écrit :
> From: Tristan Gingold [mailto:Tristan.Gingold@xxxxxxxx]
>
> >Sent: 2006年5月31日 20:19
> >To: Xu, Anthony; xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> >Subject: Re: [Xen-ia64-devel][PATCH] Enable SMP on VTI domain.
> >
> >Le Mercredi 31 Mai 2006 14:04, Xu, Anthony a écrit :
> >> From: Tristan Gingold
> >>
> >> >Sent: 2006年5月31日 20:04
> >> >To: Xu, Anthony; xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> >> >Subject: Re: [Xen-ia64-devel][PATCH] Enable SMP on VTI domain.
> >> >
> >> >Le Mercredi 31 Mai 2006 13:43, Xu, Anthony a écrit :
> >> >> From: Tristan Gingold [mailto:Tristan.Gingold@xxxxxxxx]
> >> >
> >> >[...]
> >> >
> >> >> >> Another concern is,
> >> >> >> If SMP guest is running on a UP platform, vcpus may have same
> >> >> >> vcpuid.
> >> >> >
> >> >> >Why ?  IMHO this can never happen.
> >> >>
> >> >> There are 4 LP on my box, if I want to boot a domU with 6 vcpus,
> >> >> Can this domU boot?
> >> >
> >> >[ I have never tried, but here is my understanding:]
> >> >Sure.  You can create more vcpus than existing cpus.  Of course, you
> >> > can't run 6 vcpus simultaneously on 4 cpus!
> >>
> >> If the lid of vcpus is extracted from machine lid, there are at least
> >> two vcpus whose lids are same, which may make guest OS confused.
> >
> >lid are paravirtualized except for dom0 (currently, this has to be
> > revisited).
> >
> >I think there is a misunderstanding somewhere, because some questions
> > sound too strange.
> >
> >My (small) comment was simple:
> >On Xen/VTI, GFW set lid and Xen has to build a map from lid to vcpuid.
> >I just think it should be simpler to modify GFW so that lid = vcpuid.
>
> That is exactly what I implemented.
I may have mis-read the patches you have recently posted but on the current 
changeset lid_to_vcpu is O(n).  Why isn't it O(1) ?

Tristan.

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