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 ? 2. Why does this memory allocation error happen with the Windows Guest? Barrow
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. -- |=- Red Hat, Engineering, Emerging Technologies, Boston. +1 978 392 2496 -=| |=- Perl modules: http://search.cpan.org/~danberr/ -=| |=- Projects: http://freshmeat.net/~danielpb/ -=| |=- GnuPG: 7D3B9505 F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 -=|
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@thoughtworks.com>
11/22/2006 04:12 cc
AM fedora-xen@redhat.com
Subject
Re: [Fedora-xen] 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.
--
|=- Red Hat, Engineering, Emerging Technologies, Boston. +1 978 392 2496
-=|
|=- Perl modules: http://search.cpan.org/~danberr/
-=|
|=- Projects: http://freshmeat.net/~danielpb/
-=|
|=- GnuPG: 7D3B9505 F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505
-=|
I need to make a clarification. This is not only applied to Windows Guest
OS. If all the "Physical" memory has assigned to Dom0, I
can''t add any
Fully virtualized Guest OS.
I got "virDomainCreateLinux() failed'' from virt-manager or
Can''t allocated
memory error from shell ( xm create -c win2k3 )
Paravirtualized Guest OS is fine but like I said I can''t find a way to
create a Windows Paravirtualized Guest OS.
Barrow H Kwan
<bhkwan@thoughtwo
rks.com> To
Sent by: "Daniel P. Berrange"
fedora-xen-bounce <berrange@redhat.com>
s@redhat.com cc
fedora-xen@redhat.com
Subject
11/22/2006 08:42 Re: [Fedora-xen] Can''t allocate
AM memory (12)
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@thoughtworks.com>
11/22/2006 04:12 cc
AM fedora-xen@redhat.com
Subject
Re: [Fedora-xen] 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.
--
|=- Red Hat, Engineering, Emerging Technologies, Boston. +1 978 392 2496
-=|
|=- Perl modules: http://search.cpan.org/~danberr/
-=|
|=- Projects: http://freshmeat.net/~danielpb/
-=|
|=- GnuPG: 7D3B9505 F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505
-=|
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