RE: [Xen-users] HVM memory upper limit

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

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Marcos Paulo Serafim
> Sent: 06 December 2006 18:25
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] HVM memory upper limit
> 
> Hello,
> 
> I'm trying to create a HVM virtual machine (windows guest) with 3G of
> memory but this isn't working. Xen create the domain but 
> nothing happens
> (the OS don't start and the cpu time remains 0). Things start to work
> with 2000MB or below. Is there some kind of upper limit for 
> HVM virtual
> machines?

Is this 32-bit PAE or 64-bit guest? I believe a 64-bit guest would work, but 
32-bit guest would not, as the entire guest-memory is also mapped into QEMU, 
which fails to find a contiguous memory block of 3GB (as the overall limit of 
user-space memory is 3GB, and that space has already been fragmented by loading 
the qemu-dm executable as well as any other memory allocation happening before 
the mapping of the guest memory. 2GB may well work, but 3GB is definitely more 
than a 32-bit guest can handle). There was a patch to dynamically map memory, 
which was sent in the last couple of days - that will solve this problem, and 
you could, should you wish, give a 32-bit PAE guest 8GB of memory - at least if 
the patch "does what it says on the label". I haven't seen it go into the tree 
itself, so I guess it's not going to make 3.0.4, as it's been feature frozen. 

--
Mats 


> 
> I'm using a Dell PowerEdge 8250 machine with 16GB of memory.
> 
> Thanks in advance!
> 
> -- 
> Marcos Paulo Serafim
> Analista de Suporte Técnico / Support Analyst
> mpserafim (at) gmail (dot) com
> Orlandia/SP - Brazil
> MSN: mpserafim (at) gmail (dot) com; Linux User: #171191;
> FP: EB38 D704 A4FD 2677 A2B2 A052 F44E CAA5 45FB 1F42
> 
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
> 
> 
> 



_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users