[Xen-users] Problem with restore/migration with Xen 4.0.0 and Jeremy kernel (2.6.32.12)

[Pierre POMES <ppomes@xxxxxxxxxxxx>]

Hi all,

I am using Xen 4.0.0 on top of Ubuntu Lucid (amd64), with the Jeremy 
kernel taken from git (xen/stable-2.6.32.x branch, 2.6.32.12 when I am 
writing this email). This kernel is also used in my domu.
I can save a domu without any problem, but restoring it may need from 2 
to 5 minutes, from a 1G checkpoint file (domu has 1GB RAM). There also 
errors in /var/log/xen/xend.log, "Error when reading batch size" and 
"Error when reading batch size":
[2010-05-08 04:23:16 9497] DEBUG (XendDomainInfo:1804) Storing domain 
details: {'image/entry': '18446744071587529216', 'console/port': '2', 
'image/loader': 'generic', 'vm': 
'/vm/156ea44d-6707-cbe6-2d58-7bea4792dff4', 
'control/platform-feature-multiprocessor-suspend': '1', 
'image/hv-start-low': '18446603336221196288', 'image/guest-os': 'linux', 
'image/virt-base': '18446744071562067968', 'memory/target': '1048576', 
'image/guest-version': '2.6', 'image/pae-mode': 'yes', 'description': 
'', 'console/limit': '1048576', 'image/paddr-offset': '0', 
'image/hypercall-page': '18446744071578882048', 'image/suspend-cancel': 
'1', 'cpu/0/availability': 'online', 
'image/features/pae-pgdir-above-4gb': '1', 
'image/features/writable-page-tables': '0', 'console/type': 
'xenconsoled', 'name': 'domusample', 'domid': '10', 'image/xen-version': 
'xen-3.0', 'store/port': '1'}
[2010-05-08 04:23:16 9497] DEBUG (XendCheckpoint:286) 
restore:shadow=0x0, _static_max=0x40000000, _static_min=0x0,
[2010-05-08 04:23:16 9497] DEBUG (XendCheckpoint:305) [xc_restore]: 
/usr/lib/xen/bin/xc_restore 22 10 1 2 0 0 0 0
[2010-05-08 04:23:16 9497] INFO (XendCheckpoint:423) xc_domain_restore 
start: p2m_size = 40000
[2010-05-08 04:23:16 9497] INFO (XendCheckpoint:423) Reloading memory 
pages:   0%
[2010-05-08 04:25:53 9497] INFO (XendCheckpoint:423) ERROR Internal 
error: Error when reading batch size
[2010-05-08 04:25:53 9497] INFO (XendCheckpoint:423) ERROR Internal 
error: error when buffering batch, finishing
[2010-05-08 04:25:53 9497] INFO (XendCheckpoint:423)
[2010-05-08 04:25:53 9497] INFO (XendCheckpoint:423) ^H^H^H^H100%
[2010-05-08 04:25:53 9497] INFO (XendCheckpoint:423) Memory reloaded (0 
pages)
[2010-05-08 04:25:53 9497] INFO (XendCheckpoint:423) read VCPU 0

Live migration has the same problem, it may need several minutes to 
complete. Please note that restore and migration do not fail, but there 
are very long.
My domu is on top of DRBD, and the config file is:


-------------
kernel      = '/boot/vmlinuz-2.6.32.12-it-xen'
ramdisk     = '/boot/initrd.img-2.6.32.12-it-xen'
memory      = '1024'

#
#  Disk device(s).
#
root        = '/dev/xvda2 ro'
disk        = [
                  'drbd:domusampleswap,xvda1,w',
                  'drbd:domusampleslash,xvda2,w',
              ]



#
#  Hostname
#
name        = 'domusample'

#
#  Networking
#
vif         = [ 'mac=00:16:3E:58:FC:F9' ]

#
#  Behaviour
#
on_poweroff = 'destroy'
on_reboot   = 'restart'
on_crash    = 'restart'

extra = '2 console=hvc0'
----------

I do not have any idea here.

Did somebody already have (and solve ?)  this issue ?

Thanks.
Pierre


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