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

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

Hi developer (-:

i asked the xen-solaris forum, if this bad xm-restore performance told below
happens also on a solaris-Dom0 ( refer to 
http://www.opensolaris.org/jive/thread.jspa?forumID=53&threadID=64554 )

I got the answer, that solaris "xm restore/save" is much more (about 70MB/sec @ 
zfs-volume) faster...

Is there no way to improve this performance also on linux-Dom0 systems ?
Or do I have to change my Dom0..

Regards
Danny

> -----Ursprüngliche Nachricht-----
> Von: Daniel Schwager
> Gesendet: Donnerstag, 8. Mai 2008 19:25
> An: 'xen-users@xxxxxxxxxxxxxxxxxxx'
> Cc: Daniel Schwager
> Betreff: Restoring a DomU HVM-Domain is "slow" (Bandwidth 23MB/sec from a 
> ramdisk, xen3.2.1)
> 
> 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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> Geschäftsführer: Daniel Schwager, Stefan Hörz - HRB Stuttgart 19870
> Tel: +49-711-849910-32, Fax: -932 - Mailto:daniel.schwager@xxxxxxxx
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