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xen-bugs
[Xen-bugs] [Bug 1260] New: xm mem-set domU shrinks memory of domU, but i
http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1260
Summary: xm mem-set domU shrinks memory of domU, but in dom0 it
shrinks too
Product: Xen
Version: unstable
Platform: x86-64
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Hypervisor
AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
ReportedBy: sebastia@xxxxxxxxxxxxxxxxxxxx
I tried to shrink the memory of some domU's running, to get a bit free, to be
able to start another one.
the the shell output when I tried to do this:
sre@it001:~> ssh root@xxxxxxxxxxxxxxx
Password:
Last login: Tue May 20 15:09:53 2008 from 192.168.8.30
srv2:~ # xm mem-set FTP 300
srv2:~ # vi /etc/xen/vm/OPP
srv2:~ # xm list
Name ID Mem VCPUs State Time(s)
Domain-0 0 256 2 r----- 41224.9
ECOGNITION 2 100 1 -b---- 3888.2
FTP 12 300 1 -b---- 24185.2
OGo 24 1750 1 -b---- 6758.9
OPP 9 300 1 -b---- 59158.1
WWW 18 1200 1 -b---- 61672.0
srv2:~ # xm shutdown OPP
srv2:~ # xm list
Name ID Mem VCPUs State Time(s)
Domain-0 0 256 2 r----- 41225.6
ECOGNITION 2 100 1 -b---- 3888.2
FTP 12 300 1 -b---- 24185.2
OGo 24 1750 1 -b---- 6759.3
OPP 9 300 1 r----- 59158.6
WWW 18 1200 1 ------ 61673.9
srv2:~ # xm list
Name ID Mem VCPUs State Time(s)
Domain-0 0 256 2 r----- 41226.1
ECOGNITION 2 100 1 -b---- 3888.2
FTP 12 300 1 -b---- 24185.3
OGo 24 1750 1 -b---- 6759.3
OPP 9 300 1 -b---- 59161.7
WWW 18 1200 1 -b---- 61674.3
srv2:~ # xm list
Name ID Mem VCPUs State Time(s)
Domain-0 0 256 2 r----- 41226.4
ECOGNITION 2 100 1 -b---- 3888.2
FTP 12 300 1 -b---- 24185.3
OGo 24 1750 1 -b---- 6759.3
OPP 9 300 1 -b---- 59162.2
WWW 18 1200 1 -b---- 61674.3
srv2:~ # xm list
Name ID Mem VCPUs State Time(s)
Domain-0 0 256 2 r----- 41227.4
ECOGNITION 2 100 1 -b---- 3888.3
FTP 12 300 1 -b---- 24185.3
OGo 24 1750 1 -b---- 6759.3
WWW 18 1200 1 -b---- 61674.3
srv2:~ # xm create /etc/xen/vm
vm/ vm.old/
srv2:~ # xm create /etc/xen/vm
vm/ vm.old/
srv2:~ # xm create /etc/xen/vm/OPP -c
Using config file "/etc/xen/vm/OPP".
Copy kernel /boot/vmlinuz-xen from xvda2 to /var/lib/xen/tmp/kernel.Fq2qBB for
booting
srv2:~ # Error: Not enough free memory and dom0_min_mem is 0, so I cannot
release any more. I need 410112 KiB but only have 307200.
srv2:~ # xm info
host : srv2
release : 2.6.16.57-0.9-xen
version : #1 SMP Mon Jan 21 19:55:27 UTC 2008
machine : x86_64
nr_cpus : 2
nr_nodes : 1
cores_per_socket : 2
threads_per_core : 1
cpu_mhz : 2205
hw_caps :
178bf3ff:e3d3fbff:00000000:00000010:00000001:00000000:00000002
total_memory : 3927
free_memory : 300
max_free_memory : 450
max_para_memory : 446
max_hvm_memory : 436
node_to_cpu : node0:0-1
xen_major : 3
xen_minor : 2
xen_extra : .0_16718_02-0.5
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 : 16718
cc_compiler : gcc version 4.1.2 20070115 (prerelease) (SUSE Linux)
cc_compile_by : abuild
cc_compile_domain : suse.de
cc_compile_date : Tue Jan 22 01:13:56 UTC 2008
xend_config_format : 4
srv2:~ # xm list
Name ID Mem VCPUs State Time(s)
Domain-0 0 256 2 r----- 41231.7
ECOGNITION 2 100 1 -b---- 3888.4
FTP 12 300 1 -b---- 24185.4
OGo 24 1750 1 -b---- 6759.4
WWW 18 1200 1 -b---- 61674.3
srv2:~ # xm mem-set ECOGNITION 80
srv2:~ # xm mem-set OGo 1700
srv2:~ # xm mem-set WWW 1170
srv2:~ # xm create /etc/xen/vm/OPP -c
Using config file "/etc/xen/vm/OPP".
Error: Not enough free memory and dom0_min_mem is 0, so I cannot release any
more. I need 410112 KiB but only have 286720.
srv2:~ # xm list
Name ID Mem VCPUs State Time(s)
Domain-0 0 256 2 r----- 41234.8
ECOGNITION 2 80 1 -b---- 3888.7
FTP 12 300 1 -b---- 24185.7
OGo 24 1700 1 -b---- 6762.5
WWW 18 1170 1 -b---- 61682.1
srv2:~ # xm info
host : srv2
release : 2.6.16.57-0.9-xen
version : #1 SMP Mon Jan 21 19:55:27 UTC 2008
machine : x86_64
nr_cpus : 2
nr_nodes : 1
cores_per_socket : 2
threads_per_core : 1
cpu_mhz : 2205
hw_caps :
178bf3ff:e3d3fbff:00000000:00000010:00000001:00000000:00000002
total_memory : 3927
free_memory : 280
max_free_memory : 430
max_para_memory : 426
max_hvm_memory : 417
node_to_cpu : node0:0-1
xen_major : 3
xen_minor : 2
xen_extra : .0_16718_02-0.5
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 : 16718
cc_compiler : gcc version 4.1.2 20070115 (prerelease) (SUSE Linux)
cc_compile_by : abuild
cc_compile_domain : suse.de
cc_compile_date : Tue Jan 22 01:13:56 UTC 2008
xend_config_format : 4
srv2:~ #
srv2:~ #
srv2:~ # xm list
Name ID Mem VCPUs State Time(s)
Domain-0 0 256 2 r----- 41242.5
ECOGNITION 2 80 1 -b---- 3889.0
FTP 12 300 1 -b---- 24185.9
OGo 24 1700 1 -b---- 6766.4
WWW 18 1170 1 -b---- 61705.8
as you can see in the output of xm info, the free memory is not raising.
The solution was to reboot the dom0. After that, then everything was fine
again.
The system is SLES10SP1, x86_64. The installed xen is xen 3.2.0 from the SP2.
rpm -qa | grep -i xen
xen-doc-pdf-3.2.0_16718_02-0.5
xen-3.2.0_16718_02-0.5
kernel-xen-2.6.16.57-0.9
xen-kmp-smp-3.2.0_16718_02_2.6.16.57_0.9-0.5
xen-libs-3.2.0_16718_02-0.5
xen-tools-3.2.0_16718_02-0.5
xen-tools-ioemu-3.2.0_16718_02-0.5
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