Hi all,
I have a problem with libvirt, it works slow. For example, "virsh
list" takes 6..7 seconds.
I found this in libvirt log:
...
11:38:12.765: debug : virEventDispatchHandles:477 : Dispatch n=8 f=56
w=9 e=1 0x25ce830
11:38:12.765: debug : virEventUpdateHandleImpl:147 : Update handle w=8 e=3
11:38:12.765: debug : virEventInterruptLocked:668 : Interrupting
11:38:12.766: debug : xenStoreDomainIntroduced:1421 : Some domains
were missing, trying again
11:38:12.867: debug : xenStoreDomainIntroduced:1421 : Some domains
were missing, trying again
11:38:12.968: debug : xenStoreDomainIntroduced:1421 : Some domains
were missing, trying again
(about 20 such entries)
11:38:14.681: debug : xenStoreDomainIntroduced:1421 : Some domains
were missing, trying again
11:38:14.782: debug : virEventDispatchHandles:464 : i=9 w=10
11:38:14.782: debug : virEventCleanupTimeouts:495 : Cleanup 3
11:38:14.782: debug : virEventCleanupHandles:536 : Cleanupo 10
...
That''s my time spent.
Now look at xenstored config (via script from
http://wiki.xensource.com/xenwiki/XenStore)
/vm/00000000-0000-0000-0000-000000000000/on_xend_stop=ignore
/vm/00000000-0000-0000-0000-000000000000/shadow_memory=0
/vm/00000000-0000-0000-0000-000000000000/uuid=00000000-0000-0000-0000-000000000000
/vm/00000000-0000-0000-0000-000000000000/on_reboot=restart
/vm/00000000-0000-0000-0000-000000000000/image/ostype=linux
/vm/00000000-0000-0000-0000-000000000000/image/kernel/vm/00000000-0000-0000-0000-000000000000/image/cmdline/vm/00000000-0000-0000-0000-000000000000/image/ramdisk/vm/00000000-0000-0000-0000-000000000000/on_poweroff=destroy
/vm/00000000-0000-0000-0000-000000000000/bootloader_args/vm/00000000-0000-0000-0000-000000000000/on_xend_start=ignore
/vm/00000000-0000-0000-0000-000000000000/on_crash=restart
/vm/00000000-0000-0000-0000-000000000000/xend/restart_count=0
/vm/00000000-0000-0000-0000-000000000000/vcpus=4
/vm/00000000-0000-0000-0000-000000000000/vcpu_avail=15
/vm/00000000-0000-0000-0000-000000000000/bootloader/vm/00000000-0000-0000-0000-000000000000/name=Domain-0
/vm/00000000-0000-0000-0000-000000000000-1/on_xend_stop=ignore
/vm/00000000-0000-0000-0000-000000000000-1/shadow_memory=0
/vm/00000000-0000-0000-0000-000000000000-1/uuid=00000000-0000-0000-0000-000000000000
/vm/00000000-0000-0000-0000-000000000000-1/on_reboot=restart
/vm/00000000-0000-0000-0000-000000000000-1/image/ostype=linux
/vm/00000000-0000-0000-0000-000000000000-1/image/kernel/vm/00000000-0000-0000-0000-000000000000-1/image/cmdline/vm/00000000-0000-0000-0000-000000000000-1/image/ramdisk/vm/00000000-0000-0000-0000-000000000000-1/on_poweroff=destroy
/vm/00000000-0000-0000-0000-000000000000-1/bootloader_args/vm/00000000-0000-0000-0000-000000000000-1/on_xend_start=ignore
/vm/00000000-0000-0000-0000-000000000000-1/on_crash=restart
/vm/00000000-0000-0000-0000-000000000000-1/xend/restart_count=0
/vm/00000000-0000-0000-0000-000000000000-1/vcpus=4
/vm/00000000-0000-0000-0000-000000000000-1/vcpu_avail=15
/vm/00000000-0000-0000-0000-000000000000-1/bootloader/vm/00000000-0000-0000-0000-000000000000-1/name=Domain-0
/local/domain/0/vm=/vm/00000000-0000-0000-0000-000000000000-1
/local/domain/0/device...
I have two (sometimes more) "Domain-0" vms. I think every reboot adds
a new one.
I run "xenstore-rm /vm/00000000-0000-0000-0000-000000000000",
"xenstore-rm /vm/00000000-0000-0000-0000-000000000000-1" and so on for
every entry. After reboot I have one "Domain-0" and "virsh
list" takes
0,4 second until next reboot.
Part of xend.log (reboot)::
[2012-03-21 12:17:51 1768] INFO (SrvDaemon:220) Xend exited with status 0.
[2012-03-21 12:20:53 1791] INFO (SrvDaemon:332) Xend Daemon started
[2012-03-21 12:20:53 1791] INFO (SrvDaemon:336) Xend changeset: unavailable.
[2012-03-21 12:20:55 1791] DEBUG (XendDomainInfo:149)
XendDomainInfo.recreate({''max_vcpu_id'': 3,
''cpu_time'': 10554784758L,
''ssidref'': 0, ''hvm'': 0,
''shutdown_reason'': 255, ''dying'': 0,
''online_vcpus'': 4, ''domid'': 0,
''paused'': 0, ''crashed'': 0,
''running'':
1, ''maxmem_kb'': 17179869180L, ''shutdown'': 0,
''mem_kb'': 3400960L,
''handle'': [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
''blocked'':
0, ''name'': ''Domain-0''})
[2012-03-21 12:20:55 1791] INFO (XendDomainInfo:167) Recreating domain
0, UUID 00000000-0000-0000-0000-000000000000. at /local/domain/0
[2012-03-21 12:20:55 1791] DEBUG (XendDomainInfo:3400) Storing VM
details: {''on_xend_stop'': ''ignore'',
''shadow_memory'': ''0'',
''uuid'':
''00000000-0000-0000-0000-000000000000'',
''on_reboot'': ''restart'',
''image'': ''(linux (kernel ) (superpages 0) (tsc_mode
0) (nomigrate
0))'', ''on_poweroff'': ''destroy'',
''bootloader_args'': '''',
''on_xend_start'': ''ignore'',
''on_crash'': ''restart'',
''xend/restart_count'': ''0'',
''vcpus'': ''4'',
''vcpu_avail'': ''15'',
''bootloader'': '''', ''name'':
''Domain-0''}
[2012-03-21 12:20:55 1791] DEBUG (XendDomainInfo:1804) Storing domain
details: {''cpu/3/availability'': ''online'',
''description'': '''',
''console/limit'': ''1048576'',
''memory/target'': ''3400960'',
''cpu/2/availability'': ''online'',
''vm'':
''/vm/00000000-0000-0000-0000-000000000000-1'',
''domid'': ''0'',
''cpu/0/availability'': ''online'',
''cpu/1/availability'': ''online'',
''control/platform-feature-multiprocessor-suspend'':
''1'',
''console/type'': ''xenconsoled'',
''name'': ''Domain-0''}
[2012-03-21 12:20:55 1791] DEBUG (XendDomain:464) Adding Domain: 0
[2012-03-21 12:20:55 1791] DEBUG (XendDomain:398) number of vcpus to use is 0
[2012-03-21 12:20:55 1791] DEBUG (XendDomainInfo:1891)
XendDomainInfo.handleShutdownWatch
[2012-03-21 12:20:55 1791] INFO (SrvServer:177) unix
path=/var/lib/xend/xend-socket
...
Why xen creates a new vm "Domain-0" instead of using an existing one?
Is it a bug? How can it be fixed?
My software:
root@sl03500008180:~# dpkg -l | grep xen
ii libxenstore3.0 4.0.1-4
Xenstore communications library for Xen
ii linux-image-2.6.32-5-xen-amd64 2.6.32-41
Linux 2.6.32 for 64-bit PCs, Xen dom0 support
ii xen-hypervisor-4.0-amd64 4.0.1-4
The Xen Hypervisor on AMD64
ii xen-linux-system-2.6-xen-amd64 2.6.32+29
Xen system with Linux 2.6 for 64-bit PCs (meta-package)
ii xen-linux-system-2.6.32-5-xen-amd64 2.6.32-41
Xen system with Linux 2.6.32 on 64-bit PCs (meta-package)
ii xen-qemu-dm-4.0 4.0.1-2
Xen Qemu Device Model virtual machine hardware emulator
ii xen-utils-4.0 4.0.1-4
XEN administrative tools
ii xen-utils-common 4.0.0-1
XEN administrative tools - common files
ii xenstore-utils 4.0.1-4
Xenstore utilities for Xen
root@sl03500008180:~# lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 6.0.4 (squeeze)
Release: 6.0.4
Codename: squeeze
root@sl03500008180:~# uname -a
Linux sl03500008180.opfr.local 2.6.32-5-xen-amd64 #1 SMP Mon Jan 16
20:48:30 UTC 2012 x86_64 GNU/Linux
Regards,
Dmitry
