[Xen-users] Xen - strange memory managing issue

[Marcin Kuk <marcin.kuk@xxxxxxxxx>]

Hi all,

I have strange problem with memory allocation on my xen server.

My xen server:
- distro: Debian squeeze
- xen-hypervisor: xen-hypervisor-4.0-i386            4.0.1-1
- boot options: /xen-4.0-i386.gz placeholder  dom0_mem=256M

Dom0:
- kernel: 2.6.32-5-xen-686 #1 SMP
- /etc/xen/xend-config.sxp:
    (dom0-min-mem 256)
    (enable-dom0-ballooning no)

DomU:
- name: storage
- distro: Debian squeeze
- kernel: - kernel: 2.6.32-5-xen-686 #1 SMP (the same like Dom0)
memory      = '128'
maxmem      = '512'

DomU:
- name: alien
- distro: Debian lenny
- kernel: 2.6.26-2-xen-686 #1 SMP
memory      = '320'
maxmem      = '768'

The strange thing is when I try to set memory in DomU storage.

I try to set memory on DomU storage:

storage:~$ free
             total       used       free     shared    buffers     cached
Mem:        126604     123992       2612          0      29748      59028

xen# xm list storage
Name                                        ID   Mem VCPUs      State   Time(s)
storage                                      1   128     2     -b----   6224.8

xen# xm mem-set storage 196

xen# xm list storage
Name                                        ID   Mem VCPUs      State   Time(s)
storage                                      1   196     2     -b----   6225.2

storage:~$ free
             total       used       free     shared    buffers     cached
Mem:        126604     123732       2872          0      30044      60748

I can see on Dom0 that DomU 'storage' has 196MB, but on DomU 'storage'
I don't see it.
In other case if I set for example 90 - it is working. But I can't set
over 128 (startup setting)

But in another example all is ok:

alien:~$ free
             total       used       free     shared    buffers     cached
Mem:        327680     313544      14136          0       4232      33956

xen# xm list alien
Name                                        ID   Mem VCPUs      State   Time(s)
alien                                        2   320     2     -b----    993.7

xen# xm mem-set alien 400

xen# xm list alien
Name                                        ID   Mem VCPUs      State   Time(s)
alien                                        2   400     2     -b----    994.2

alien:~$ free
             total       used       free     shared    buffers     cached
Mem:        409600     313816      95784          0       4292      33960

I am trying to change balloonig settnigs, other memory setting,
rebooting a lot, but nothing helped.
I have several DomUs and I found that I can manage memory on kernels
2.6.26, but not above.

Any idea what is wrong?

Best regards,
Marcin Kuk

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