RE: [Xen-ia64-devel] SMP-g status.

["Magenheimer, Dan (HP Labs Fort Collins)" <dan.magenheimer@xxxxxx>]

> -----Original Message-----
> From: Yang, Fred [mailto:fred.yang@xxxxxxxxx] 
> Sent: Wednesday, April 26, 2006 3:42 PM
> To: Magenheimer, Dan (HP Labs Fort Collins); Tristan Gingold; 
> xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-ia64-devel] SMP-g status.
> 
> >-----Original Message-----
> >From: xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx 
> >[mailto:xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf 
> >Of Magenheimer, Dan (HP Labs Fort Collins)
> >Sent: Wednesday, April 26, 2006 1:46 PM
> >To: Tristan Gingold; xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> >Subject: RE: [Xen-ia64-devel] SMP-g status.
> >
> >> From: Tristan Gingold [mailto:Tristan.Gingold@xxxxxxxx] 
> >> Sent: Wednesday, April 26, 2006 1:33 AM
> >> To: Magenheimer, Dan (HP Labs Fort Collins); 
> >> xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> >> Subject: Re: [Xen-ia64-devel] SMP-g status.
> >> 
> >> Le Mardi 25 Avril 2006 18:43, Magenheimer, Dan (HP Labs Fort 
> >> Collins) a écrit 
> >> :
> >> > Wow!  Amazing work, Tristan!
> >> >
> >> > Is this a 4-socket "future processor" with 2 cores
> >> > and 2 threads on each core?
> >> Yes, 4 montecito with 4 threads.
> >> 
> >> >  I wonder if the threading
> >> > mechanism on this processor differs sufficiently
> >> > from hyperthreading on x86 that Xen/ia64 might need
> >> > to deal differently with threads?
> >> What do you mean by to deal ?
> >
> >There are many different ways of architecting hyperthreading.
> >Some may be better suited for one software implementation
> >than another.  Saying anything further would probably
> >be inappropriate so would have to wait until chips are
> >available publicly.
> >
> Multi-threading shares pipeline and cache within a core.  
> Xen/IA64 has separated RID set for each domain, allocating 
> new domain base on per core scheduling may be a better 
> approach for start

Can I read this as saying that scheduling different domains on
different threads on the same core is probably not a good
idea?  Does Xen/x86 do this?

Dan

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