[one-users] Xen problem - Dom0 using up all memory on Scientific Linux

[makhanmail]

Hi again,

I got another problem with configuration of my new cloud. Although there  
is no big process running in the system, xentop states the Domain-0 is  
using up 95% of the RAM. The same thing is happening on two completely  
different servers, so I think it may have something to do with OS, which  
is Scientific Linux 5.4.

Do you know what may be the cause and how to fix this?

Regards,
Maciej




[root at phrixus ~]# xentop -bi1
xentop - 20:53:57   Xen 3.1.2-164.2.1.el5
1 domains: 1 running, 0 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown
Mem: 16776548k total, 16383780k used, 392768k free    CPUs: 8 @ 2666MHz
       NAME  STATE   CPU(sec) CPU(%)     MEM(k) MEM(%)  MAXMEM(k) MAXMEM(%)  
VCPUS NETS NETTX(k) NETRX(k) VBDS   VBD_OO   VBD_RD   VBD_WR SSID
   Domain-0 -----r        650    0.0   16038912   95.6   no limit        
n/a     8    5    16244    94733    0        0        0        0    0

[root at phrixus ~]# free
              total       used       free     shared    buffers     cached
Mem:      16038912    1451612   14587300          0     196588     669004
-/+ buffers/cache:     586020   15452892
Swap:     18481144          0   18481144

[root at phrixus ~]# xm info
host                   : phrixus
release                : 2.6.18-164.2.1.el5xen
version                : #1 SMP Tue Sep 29 19:06:31 EDT 2009
machine                : x86_64
nr_cpus                : 8
nr_nodes               : 1
sockets_per_node       : 2
cores_per_socket       : 4
threads_per_core       : 1
cpu_mhz                : 2666
hw_caps                :  
bfebfbff:20000800:00000000:00000140:000ce3bd:00000000:00000001
total_memory           : 16383
free_memory            : 383
node_to_cpu            : node0:0-7
xen_major              : 3
xen_minor              : 1
xen_extra              : .2-164.2.1.el5
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_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : unavailable
cc_compiler            : gcc version 4.1.2 20080704 (Red Hat 4.1.2-46)
cc_compile_by          : brewbuilder
cc_compile_domain      : fnal.gov
cc_compile_date        : Tue Sep 29 18:42:12 EDT 2009
xend_config_format     : 2


[root at phrixus ~]# lsb_release -a
LSB Version:     
:core-3.1-amd64:core-3.1-ia32:core-3.1-noarch:graphics-3.1-amd64:graphics-3.1-ia32:graphics-3.1-noarch
Distributor ID: ScientificSL
Description:    Scientific Linux SL release 5.4 (Boron)
Release:        5.4
Codename:       Boron

[root at phrixus ~]# uname -a
Linux phrixus 2.6.18-164.2.1.el5xen #1 SMP Tue Sep 29 19:06:31 EDT 2009  
x86_64 x86_64 x86_64 GNU/Linux


[root at nephele ~]# xentop -bi1
xentop - 21:01:49   Xen 3.1.2-164.2.1.el5
1 domains: 1 running, 0 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown
Mem: 4192600k total, 3799740k used, 392860k free    CPUs: 4 @ 2394MHz
       NAME  STATE   CPU(sec) CPU(%)     MEM(k) MEM(%)  MAXMEM(k) MAXMEM(%)  
VCPUS NETS NETTX(k) NETRX(k) VBDS   VBD_OO   VBD_RD   VBD_WR SSID
   Domain-0 -----r       2297    0.0    3665920   87.4   no limit        
n/a     4    6     8843   434339    0        0        0        0    0

[root at nephele ~]# free
              total       used       free     shared    buffers     cached
Mem:       3665920    1336244    2329676          0     243360     706732
-/+ buffers/cache:     386152    3279768
Swap:      6062072          0    6062072

[root at nephele ~]# xm info
host                   : nephele.ifj.edu.pl
release                : 2.6.18-164.2.1.el5xen
version                : #1 SMP Tue Sep 29 19:06:31 EDT 2009
machine                : x86_64
nr_cpus                : 4
nr_nodes               : 1
sockets_per_node       : 1
cores_per_socket       : 4
threads_per_core       : 1
cpu_mhz                : 2394
hw_caps                :  
bfebfbff:20100800:00000000:00000140:0000e3bd:00000000:00000001
total_memory           : 4094
free_memory            : 383
node_to_cpu            : node0:0-3
xen_major              : 3
xen_minor              : 1
xen_extra              : .2-164.2.1.el5
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_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : unavailable
cc_compiler            : gcc version 4.1.2 20080704 (Red Hat 4.1.2-46)
cc_compile_by          : brewbuilder
cc_compile_domain      : fnal.gov
cc_compile_date        : Tue Sep 29 18:42:12 EDT 2009
xend_config_format     : 2