Re: [Xen-users] dom0_mem not working in debian wheezy

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

So you can't even manually balloon up? The blog seems to suggest that
this can be necessary with some kernel+Xen combinations.

Beyond that I'm afraid I've no other ideas.

On Thu, 2014-09-04 at 18:17 +0800, kevin.zhang@xxxxxxxxxxx wrote:
> Ian Campbellï
>     Thank you for your reply.
>     I've read the page you provided, but my situation is different.
>     Even I set dom0_mem=6G,max:8G, the displayed  domain-0 memory is
> still 3979. It seems that it can provide no more than 4G
> I don't know why the same option differ from 1 socket and 2 socket
> servers.
> 
> 
> This time dom0_mem=6G,max:8G
> 
> 
> root@ServerV3:~# xm list 0 
> Name ID Mem VCPUs State Time(s) 
> Domain-0 0 3979 40 r----- 1549.2
> 
> 
> root@ServerV3:~# cat /proc/meminfo 
> MemTotal: 3737508 kB 
> MemFree: 2603036 kB
> 
> 
> root@erverV3:~# free -m 
> total used free shared buffers cached 
> Mem: 3649 1120 2529 0 41 260
> 
>     By the way, my 2 sockets server is using E5 2650v3, DDR4 64G, it's
> from Intel Lab, while my 1 socket server is I5 CPU DDR3 16G.
> 
> 
> 
> ______________________________________________________________________
> Best Regards
> 
> 
>          
>         From: Ian Campbell
>         Date: 2014-09-04 17:34
>         To: kevin.zhang@xxxxxxxxxxx
>         CC: xen-users
>         Subject: Re: [Xen-users] dom0_mem not working in debian wheezy
>         On Thu, 2014-09-04 at 11:32 +0800, kevin.zhang@xxxxxxxxxxx
>         wrote:
>         > 
>         > Hi all,
>         > 
>         > 
>         >       Today I found that dom0_mem option does not work in my
>         64G 2 cpu
>         > server , but works in my 16G 1 CPU server.
>         > I am using debian wheezy and xen 4.3.3.
>         >       Firstly I set GRUB_CMDLINE_XEN="dom0_mem=6G,max:6G"
>         > in /etc/default/grub,  
>         >  Then execute:  
>         >     update-grub
>         >  After rebooting,  execute:
>         >       xm list 0 
>         >   Only see no more than 3967M reserved for Domain-0 in my
>         64G 2CPU
>         > server, however, my 16G 1CPU server display correctly.
>         >   If I use xm mem-set 0 5000, dom0 memory also can be
>         raised.
>         >   But why it does not work with dom0_mem option?
>          
>         Does
>         http://blog.xen.org/index.php/2012/04/30/memory-where-it-has-not-gone/
>         relate to your situation?
>          
>         Ian.
>          
>          
>          



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