RE: [Xen-users] SMP and Memory Limits

["Petersson, Mats" <mats.petersson@xxxxxxx>]

[Resent to the xen-users list]
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Gordan Bobic
> Sent: 20 September 2005 11:38
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] SMP and Memory Limits
> 
> Hi,
> 
> 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. Processor count I'm not sure
of, but I would think that it would be capable of running on 16
processors... 

--
Mats

> 
> Best regards.
> 
> Gordan


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