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Re: [Xen-users] Problem with restore/migration with Xen 4.0.0 and Jeremy

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Problem with restore/migration with Xen 4.0.0 and Jeremy kernel (2.6.32.12)
From: Pierre POMES <ppomes@xxxxxxxxxxxx>
Date: Wed, 12 May 2010 17:28:26 -0400
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Hi,

First sorry for the double posting...

I just built a 2.6.32.10 kernel with Andrew Lyon patches (so it is a "xenlinux" kernel, not a "pvops" kernel).

Live migration and restore operations are between 4 and 10 times faster with this kernel . Furthermore, during live migration, hangs time in domu are shorter (1-2 seconds versus 1 to 15 seconds for a domu with 256M RAM).

Error messages "Error when reading batch size" / "error when buffering batch, finishing" are still in my logs.

Regarding times, all is now similar to what I had with Xen 3.x on top of xenlinux kernels.

Regards,
Pierre



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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