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Re: [Xen-devel] Re: NUMA and SMP

On Wed, 2007-03-21 at 09:08 +0800, tgh wrote:
> Thank you for your reply
> Daniel Stodden åé:
> > On Tue, 2007-03-20 at 21:10 +0800, tgh wrote:
> >   
> >> I am puzzled ,what is the page migration?
> >> Thank you in advance
> >>     
> >
> > NUMA is clear? NUMA distributes main memory across multiple memory
> > interfaces.
> >
> > This used to be a feature reserved to high-end multiprocessor
> > architectures, but in servers it is becoming sort of a commodity these
> > days, in part due AMD multiprocessor systems being NUMA systems these
> > days. AMD64 processors carry an integrated memory controller. So, if you
> > buy an SMP machine with AMD processors today, you'd find each slice of
> > the total memory being connected to a different processor inside.
> >
> > Note that this doesn't break the 'symmetric' in 'SMP': it still remains
> > a global, flat physical address space. The processors have interconnects
> > by which memory can be read from remote processors as well, and will do
> > so transparently to system and application software.
> >   
> that is ,in the smp with adm64,it is a numa in the hardware 
> architecture,while a smp in the system software,is it right?

i believe you mean the right thing. it remains a regular smp
architecture. system software remains smp.


Daniel Stodden
LRR     -      Lehrstuhl fÃr Rechnertechnik und Rechnerorganisation
Institut fÃr Informatik der TU MÃnchen             D-85748 Garching
http://www.lrr.in.tum.de/~stodden         mailto:stodden@xxxxxxxxxx
PGP Fingerprint: F5A4 1575 4C56 E26A 0B33  3D80 457E 82AE B0D8 735B

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