Re: Can't allocate memory (12)

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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@xxxxxxxxxx>               
             s@xxxxxxxxxx                                               cc 
                                       fedora-xen@xxxxxxxxxx               
                                                                   Subject 
             11/22/2006 08:42          Re:  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@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.
--
|=- 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
-=|


--
Fedora-xen mailing list
Fedora-xen@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/fedora-xen


--
Fedora-xen mailing list
Fedora-xen@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/fedora-xen

[Index of Archives]     [Fedora General]     [Fedora Music]     [Linux Kernel]     [Fedora Desktop]     [Fedora Directory]     [PAM]     [Big List of Linux Books]     [Gimp]     [Yosemite News]

  Powered by Linux