RE: [Xen-users] SMP and Memory Limits

[Gordan Bobic <gordan@xxxxxxxxxx>]

>> What are the limits on how many CPUs and how much memory Xen 
supports? I am interested in this for both the host (0) kernel and the 
client (U) kernel.
>>
>> I am looking at getting some 16-way (8-way dual-core) Opteron 
systems with about 64 GB of RAM for prototyping, so I would like to make 
sure that Xen can use up all of the resources of such a machine.
>
>
>
> In Xen-unstable (to become 3.0) I believe there is no software limits
> for CPU count or memory amount, only whatever limits the hardware
> dictates (i.e. 40 bits of hardware address, 48 bits available in virtual
> space). If there are any other limitations, it's probably fair to
> consider it a bug, and report such failings on the Xen-Devel mailing
> list.
> Obviously, 2.0.x, only supporting 32-bit in non-PAE mode would not be
> able to use more than about 3.5GB of RAM.


Is that 3.5 GB per dom-U/dom-0, or the total between dom-0 and all 
dom-Us put together?
> Processor count I'm not sure
> of, but I would think that it would be capable of running on 16
> processors...


OK, thanks.

Gordan

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