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xen-users
RE: [Xen-users] HVM memory upper limit
> -----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
>
>
>
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