Re: [Xen-users] maximum domain memory

[Igor Serebryany <igor47@xxxxxxxxxxx>]

Nevermind, sort of,

        This is actually an 8GB box. The problem appears to be that whenever
        a domain is created, the amount of memory it's using is deducted
        from total memory and this amount is never restored, even after the
        domain goes away:

xen1:~# free -m
             total       used       free     shared    buffers     cached
Mem:          7029        335       6693          0          6         35
-/+ buffers/cache:        293       6735
Swap:         4102          0       4102
xen1:~# free -m
             total       used       free     shared    buffers     cached
Mem:          3031        517       2513          0          7        211
-/+ buffers/cache:        297       2733
Swap:         4102          0       4102

        This is Xen 3.2 on Debian Lenny. Here is my 'xm info' -- anyone else
        notice a similar problem?

xen1:~# xm info
host                   : xen1.mydomain.com
release                : 2.6.26-2-xen-amd64
version                : #1 SMP Wed Mar 10 00:29:48 UTC 2010
machine                : x86_64
nr_cpus                : 4
nr_nodes               : 1
cores_per_socket       : 4
threads_per_core       : 1
cpu_mhz                : 2327
hw_caps                : 
bfebfbff:20100800:00000000:00000140:0408e39d:00000000:00000001
total_memory           : 8190
free_memory            : 2234
node_to_cpu            : node0:0-3
xen_major              : 3
xen_minor              : 2
xen_extra              : -1
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p 
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : unavailable
cc_compiler            : gcc version 4.3.1 (Debian 4.3.1-2) 
cc_compile_by          : waldi
cc_compile_domain      : debian.org
cc_compile_date        : Sat Jun 28 09:32:18 UTC 2008
xend_config_format     : 4

--Igor

On Mon, Aug 02, 2010 at 09:25:34PM -0500, Igor Serebryany wrote:
> Hi, 
> 
>       I'm trying to figure out what the maximum amount of memory that can
>       be assigned to a domain is. I created a domain with a ludicrous
>       amount of memory and then tried to start it up, and got the
>       following error:
> 
>       Error: I need 9999360 KiB, but dom0_min_mem is 200704 and shrinking
>       to 200704 KiB would leave only 7001948 KiB free.
> 
>       I am wondering: where did the value 7001948 come from. Here is the
>       output of free on Dom-0:
> 
>              total       used       free     shared    buffers     cached
> Mem:       1959936    1722756     237180          0      20680    1306968
> -/+ buffers/cache:     395108    1564828
> Swap:      4200988        744    4200244
> 
>       The box has 2 GB (usually 2065264 kB) of ram (so 105328 kB already
>       seems to be missing). However, if I add up total memory + total swap
>       I still get only 6266252 kB free, and this is not even counting what
>       Xen has already reserved...
> 
> --Igor



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