Re: [Xen-users] High Memory Support on systems >1GB

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

> On a Xen 2.0.7 host with between one and four GB of RAM but no single
> domain larger than 880MB, how should kernel High Memory Support be
> configured? Should it be off since no domain kernel is using more than
> 880?

Xen will support all your memory (unless there's a big memory hole, causing 
some of it to be mapped above 4Gig).  Domains only need highmem4g if they're 
going to individually use more than 880.

> Should dom0 have it enabled to manage all the memory?

Nope, Xen manages all the memory, so you should be fine.

> Should all  
> the domains have it since they are drawing on a pool larger than 880 MB?

Nope.  But...

*if* you need PAE, then Xen and all domains do need to use PAE.

> Is the answer the same for Xen 3.0? Thanks - John

Yes. (and PAE is Xen 3 only).

Cheers,
Mark

-- 
Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

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