Xen project Mailing List

On 3 September 2011 06:44, Ian Tobin <itobin@xxxxxxxxxxxxx> wrote:

Hi,

Same issue here, running Debian 6 with 2.6.32.43 and xen 4.1.1.

Not found a solution yet though ive not had time to test.

Thanks

Ian

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Dennis Storm
Sent: 02 September 2011 20:45
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Physical memory not fully available to DomU's

Hi,

I'm having a weird problem with one of my Xen machines. I have a 96Gb ram server, running on Debian 6 with Xen kernel. However, I can only assign memory out of a pool of 24GB, the rest is unavailable for assignment. When trying to run a new DomU i'm getting the error that there isn't enough free ram. However, when I do the math myself I can see that there's 22GB of ram in use, which leave 74GB available (minus
Dom0 minimum limit, which is set at 8GB).

I've tried disabling ballooning, i als saw posts of ram missing due to the balloondriver, but nothing in the likes of this volume of missing ram.

Any help would be very much appreciated. Seems a shame to let 74GB go to waste. If you need any more info, please let me know!

XM info output:
--------------
host : <blotted out>
release : 2.6.32-5-xen-amd64
version : #1 SMP Tue Jun 14 12:46:30 UTC 2011
machine : x86_64
nr_cpus : 16
nr_nodes : 2
cores_per_socket : 4
threads_per_core : 2
cpu_mhz : 2400
hw_caps :
bfebfbff:2c100800:00000000:00001f40:009ee3fd:00000000:00000001:00000000
virt_caps : hvm
total_memory : 98295
free_memory : 19
node_to_cpu : node0:0-3,8-11
node1:4-7,12-15
node_to_memory : node0:19
node1:0
node_to_dma32_mem : node0:0
node1:0
max_node_id : 1
xen_major : 4
xen_minor : 0
xen_extra : .1
xen_caps : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler : credit
xen_pagesize : 4096
platform_params : virt_start=0xffff800000000000
xen_changeset : unavailable
xen_commandline : placeholder
cc_compiler : gcc version 4.4.5 (Debian 4.4.5-10)
cc_compile_by : waldi
cc_compile_domain : debian.org
cc_compile_date : Wed Jan 12 14:04:06 UTC 2011
xend_config_format : 4
--------------

XM List output:
-----------
Name ID Mem VCPUs State
Time(s)
Domain-0 0 11257 16 r-----
24477.0
<hostname blotted out> 25 256 8 -b----
4233.8
<hostname blotted out> 11 1024 8 -b----
1725.5
<hostname blotted out> 2 4192 8 r-----
66563.5
<hostname blotted out> 3 512 16 -b----
15330.1
<hostname blotted out> 17 512 16 -b----
5249.6
<hostname blotted out> 18 512 16 -b----
12292.2
<hostname blotted out> 19 512 1 -b----
6620.5
<hostname blotted out> 8 512 16 -b----
1554.6
<hostname blotted out> 9 1024 4 -b----
1837.1
<hostname blotted out> 12 1024 4 -b----
5932.5
<hostname blotted out> 13 1024 16 -b----
35491.3
<hostname blotted out> 22 1024 8 -b----
5505.7
<hostname blotted out> 20 512 1 -b----
15667.6
<hostname blotted out> 23 2816 8 -b----
6621.9
<hostname blotted out> 26 512 1 -b----
11633.6
<hostname blotted out> 28 512 16 -b----
906.9
<hostname blotted out> 15 512 1 -b----
17502.6
<hostname blotted out> 27 256 1 -b----
3924.0
<hostname blotted out> 7 512 1 -b----
12216.5
<hostname blotted out> 6 512 1 -b----
9732.1
<hostname blotted out> 29 2048 16 -b----
1738.4
<hostname blotted out> 4 256 8 -b----
4346.0
<hostname blotted out> 30 2048 8 -b----
4066.8

Total ram used for all DomU's: 22624MB
----------------------

Config for DomU (generic for all running DomU's, except ram and core
assignments)
----------------------

#
# Kernel + memory size
#
kernel = '/boot/vmlinuz-2.6.32-5-xen-amd64'
ramdisk = '/boot/initrd.img-2.6.32-5-xen-amd64'

memory = '2048'
vcpus = '8'
extra = 'xencons=tty'

#
# Disk device(s).
#
root = '/dev/xvda1 ro'
disk = [ 'file:/storage/target/disk.img,xvda,w',
'file:/storage/target/swap.img,xvdb,w' ]

#
# Hostname
#
name = '<hostname blotted out>'

#
# Networking
#
vif = [ 'ip=<obscured>' ]

#
# Behaviour
#
> on_reboot = 'restart'
on_crash = 'restart'

--------

xend-config.sxp
--------
(network-script network-bridge)
(vif-script vif-bridge)
(dom0-min-mem 196)
(enable-dom0-ballooning yes)
(total_available_memory 0)
(dom0-cpus 0)
----------

Kind regards,

Dennis Storm - Drecomm BV

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Re: [Xen-users] Physical memory not fully available to DomU's