here are more information about the issue
When all memories are allocated to Dom0, I can add Paravirtualized Guest OS
but this limited to Linux OS ( I mean I don't know if it is possible to run
Windows as a Paravirtualized VM ). If I tried to add a FULLY Virtualized
Guest OS, I will get this error. To fix this, I have to change the memory
for Dom0 ( under Grub ). I have a 16G box and when I assigned 14G to the
Dom0, then I can add a Fully Virtuallized Windows Guest OS with 1.5G
memory. When I tried to add another Windows Guest OS with 1G memory, I
got the same memory error again.
My guess is the number of fully virtualized Windows Guest OS I can run will
depend on the "phyical" memory that I have. for example, if I have a 16G
box, if I allocate 4G memory for a Windows Guest OS, I can only run 4 of
them ( ie 4 x 4G = 16G ). Unless this is a problem with the FC6's Xen.
"Daniel P.
Berrange"
<berrange@redhat. To
com> Barrow H Kwan
<bhkwan@xxxxxxxxxxxxxxxx>
11/22/2006 04:12 cc
AM fedora-xen@xxxxxxxxxx
Subject
Re: Can't allocate
Please respond to memory (12)
"Daniel P.
Berrange"
<berrange@redhat.
com>
On Tue, Nov 21, 2006 at 11:40:57PM -0800, Barrow H Kwan wrote:
>
> This happen when I tried to create a Windows Guest. After few days of
> struggling, I just found out Domain-0 has been assigned 99% of the
physical
> memory "BY DEFAUT". I am wondering
>
> 1. Why does Fedora assign 99% to all phsical memory to Domain-0 ?
Dom0 gets essentially 100% of all memory at boot time. XenD will use the
balloon driver to take memory away from Dom0 when it is needed to launch
a new guest. Of course this relies on you not actively using that memory
in Dom0 but in general it just works. If balooning were failing though
you would see a different error - one saying it was unable to balloon
down the dom0. The 'cannot allocate memory' error suggests a more
fundamental problem.
> 2. Why does this memory allocation error happen with the Windows Guest?
Running 'xm dmesg' shortly after creating the guest may be helpful
in tracking down actual errors.
Regards,
Dan.
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