[Xen-users] Restoring a DomU HVM-Domain is "slow" (Bandwidth 23MB/sec from a ramdisk, xen3.2.1)

["Daniel Schwager" <Daniel.Schwager@xxxxxxxx>]

Hi,

i do some tests with restoring HVM winxp-domU's. 

Even, if i restore a saved DomU from a ramdisk, the 
Restoring-process has only a bandwidth about 23MB/sec:

Here a example restoring an 512MB HVM opensuse10.3 DomU

......
[2008-05-07 22:40:12 3314] DEBUG (XendCheckpoint:218) restore:shadow=0x5, 
_static_max=0x20000000, _static_min=0x0,
[2008-05-07 22:40:12 3314] DEBUG (balloon:132) Balloon: 12803896 KiB free; need 
537600; done.
[2008-05-07 22:40:12 3314] DEBUG (XendCheckpoint:235) [xc_restore]: 
/usr/lib64/xen/bin/xc_restore 31 186 2 3 1 1 1
[2008-05-07 22:40:12 3314] INFO (XendCheckpoint:373) xc_domain_restore start: 
p2m_size = 100000
[2008-05-07 22:40:12 3314] INFO (XendCheckpoint:373) Reloading memory pages:   
0%
[2008-05-07 22:40:35 3314] INFO (XendCheckpoint:373) Received all pages (0 
races)
[2008-05-07 22:40:35 3314] INFO (XendCheckpoint:373) Restore exit with rc=0
[2008-05-07 22:40:35 3314] DEBUG (XendCheckpoint:344) store-mfn 131070
[2008-05-07 22:40:35 3314] DEBUG (XendDomainInfo:1838) 
XendDomainInfo.completeRestore
.....
[2008-05-07 22:40:35 3314] INFO (image:289) spawning device models: 
/usr/lib64/xen/bin/qemu-dm ['/usr/lib64/xen/bin/qemu-dm', '-d', '186', 
'-domain-name', 'opensuse-4d-VM3233', '-vnc', '0.0.0.0:0', '-vncunused', 
'-vcpus', '1', '-boot', 'c', '-serial', 'pty', '-acpi', '-usb', '-usbdevice', 
'tablet', '-net', 'nic,vlan=1,macaddr=00:50:56:00:00:36,model=rtl8139', '-net', 
'tap,vlan=1,bridge=xenbr', '-M', 'xenfv', '-loadvm', 
'/var/lib/xen/qemu-save.186']
[2008-05-07 22:40:35 3314] INFO (image:293) device model pid: 27287
[2008-05-07 22:40:35 3314] DEBUG (XendDomainInfo:1008) Storing domain details: 
{'console/port': '3', 'name': 'opensuse-4d-VM3233', 'console/limit': '1048576', 
'store/port': '2', 'vm': '/vm/f7f79797-f2ec-a9af-61b0-c09747ca2874-1', 'domid': 
'186', 'image/suspend-cancel': '1', 'cpu/0/availability': 'online', 
'memory/target': '524288', 'control/platform-feature-multiprocessor-suspend': 
'1', 'store/ring-ref': '131070', 'console/type': 'ioemu'}
[2008-05-07 22:40:35 3314] DEBUG (XendDomainInfo:1851) 
XendDomainInfo.completeRestore done
[2008-05-07 22:40:35 3314] DEBUG (DevController:151) Waiting for devices vif.
[2008-05-07 22:40:35 3314] DEBUG (XendDomainInfo:1092) 
XendDomainInfo.handleShutdownWatch
.....

Is there a possibility to speedup the restore process ? Is there such
a improvement on the roadmap ?

Regards
Danny

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DT Netsolution GmbH   -   Taläckerstr. 30    -    D-70437 Stuttgart
Geschäftsführer: Daniel Schwager, Stefan Hörz - HRB Stuttgart 19870
Tel: +49-711-849910-32, Fax: -932 - Mailto:daniel.schwager@xxxxxxxx



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