dom0 free memory and grub2

[Arindam Choudhury]

Hi,

I have installed xen on fedora 17 using yum.

I have the well known problem on dom0

total_memory           : 6075
free_memory            : 644

I know I have to set dom0_mem=*XXX*G,max:*XXX*G and by recover the memory
released.
link<http://blog.xen.org/index.php/2012/04/30/do%EF%BB%BFm0-memory-whe...

But how to do it with grub2?

Thanks,
Arindam

[Konrad Rzeszutek Wilk]

On Wed, Jun 27, 2012 at 05:58:56PM +0200, Arindam Choudhury wrote:
>  Hi,
>  
>  I have installed xen on fedora 17 using yum.
>  
>  I have the well known problem on dom0
>  
>  total_memory           : 6075
>  free_memory            : 644
>  
>  I know I have to set dom0_mem=*XXX*G,max:*XXX*G and by recover the memory
>  released.
> link<http://blog.xen.org/index.php/2012/04/30/do%EF%BB%BFm0-memory-whe...
>  
>  But how to do it with grub2? 
Edit /etc/default/grub and re-run grub-mkconfig -o /boot/grub2/grub.cfg

>  
>  Thanks,
>  Arindam 
>  --
>  xen mailing list
>  xen(a)lists.fedoraproject.org
>  https://admin.fedoraproject.org/mailman/listinfo/xen

[Arindam Choudhury]

Hi,
I tried doing that but it failed
#cat /etc/default/grub
  GRUB_TIMEOUT=5
  GRUB_DISTRIBUTOR="Fedora"
  GRUB_DEFAULT=saved
  GRUB_CMDLINE_LINUX="rd.md=0 rd.lvm=0 rd.dm=0 SYSFONT=True rd.luks=0
KEYTABLE=es
  LANG=en_US.UTF-8 rhgb"
  GRUB_CMDLINE_XEN= "dom0_mem=2G,max:2G"
  #GRUB_THEME="/boot/grub2/themes/system/theme.txt"
# grub2-mkconfig -o /boot/grub2/grub.cfg
  /etc/default/grub: line 5: dom0_mem=2G,max:2G: command not found


On Wed, Jun 27, 2012 at 5:56 PM, Konrad Rzeszutek Wilk <
konrad.wilk(a)oracle.com&gt; wrote:

>  On Wed, Jun 27, 2012 at 05:58:56PM +0200, Arindam Choudhury wrote:
>  > Hi,
>  >
>  > I have installed xen on fedora 17 using yum.
>  >
>  > I have the well known problem on dom0
>  >
>  > total_memory           : 6075
>  > free_memory            : 644
>  >
>  > I know I have to set dom0_mem=*XXX*G,max:*XXX*G and by recover the memory
>  > released. link<
>  http://blog.xen.org/index.php/2012/04/30/do%EF%BB%BFm0-memory-where-it-ha...
>  >
>  >
>  > But how to do it with grub2?
>
>  Edit /etc/default/grub and re-run grub-mkconfig -o /boot/grub2/grub.cfg
>
>  >
>  > Thanks,
>  > Arindam
>
>  > --
>  > xen mailing list
>  > xen(a)lists.fedoraproject.org
>  > https://admin.fedoraproject.org/mailman/listinfo/xen
>
>

[Konrad Rzeszutek Wilk]

On Wed, Jun 27, 2012 at 06:11:39PM +0200, Arindam Choudhury wrote:
>  Hi,
>  I tried doing that but it failed
>  #cat /etc/default/grub
>    GRUB_TIMEOUT=5
>    GRUB_DISTRIBUTOR="Fedora"
>    GRUB_DEFAULT=saved
>    GRUB_CMDLINE_LINUX="rd.md=0 rd.lvm=0 rd.dm=0 SYSFONT=True rd.luks=0
>  KEYTABLE=es
>    LANG=en_US.UTF-8 rhgb"
>    GRUB_CMDLINE_XEN= "dom0_mem=2G,max:2G" 
                     ^
Why do you have a space there?

[Pasi Kärkkäinen]

On Wed, Jun 27, 2012 at 05:58:56PM +0200, Arindam Choudhury wrote:
>     Hi,
>  
>     I have installed xen on fedora 17 using yum.
>  
>     I have the well known problem on dom0
>  
>     total_memory           : 6075
>     free_memory            : 644
>  
>     I know I have to set dom0_mem=XXXG,max:XXXG and by recover the memory
>     released. [1]link
>  
>     But how to do it with grub2?
>   
edit "/etc/default/grub" file

add/edit lines:
GRUB_DEFAULT="Xen"
GRUB_CMDLINE_XEN="dom0_mem=1024M,max:1024M loglvl=all guest_loglvl=all"

Run "grub2-mkconfig -o /boot/grub2/grub.cfg" to update the configuration.

-- Pasi