Re: Block Migration and xbzrle

Orit Wasserman
2012-10-02T10:40:07Z

On 10/02/2012 11:30 AM, Peter Lieven wrote:
>
> Am 02.10.2012 um 11:28 schrieb Orit Wasserman:
>
>> On 10/02/2012 10:33 AM, lieven-lists@dlh.net wrote:
>>> Orit Wasserman wrote:
>>>> On 09/16/2012 01:39 PM, Peter Lieven wrote:
>>>>> Hi,
>>>>>
>>>>> I remember that this was broken some time ago and currently with
>>>>> qemu-kvm 1.2.0 I am still not able to use
>>>>> block migration plus xbzrle. The migration fails if both are used
>>>>> together. XBZRLE without block migration works.
>>>>>
>>>>> Can someone please advise what is the current expected behaviour?
>>>> XBZRLE only work on guest memory so it shouldn't be effected by block
>>>> migration.
>>>> What is the error you are getting?
>>>> What command line ?
>>>
>>> Meanwhile I can confirm that it happens with and without block migration.
>>> I I observe 2 errors:
>>> a)
>>> qemu: warning: error while loading state section id 2
>>> load of migration failed
Did you enabled XBZRLE on the destination also?
(migrate_set_capability xbzrle on)

Orit
>>> b)
>>> the vm does not enter running state after migration.
>>>
>>> The command-line:
>>> /usr/bin/qemu-kvm-1.2.0 -net
>>> tap,vlan=798,script=no,downscript=no,ifname=tap1 -net
>>> nic,vlan=798,model=e1000,macaddr=52:54:00:ff:01:15 -drive
>>> format=host_device,file=/dev/mapper/iqn.2001-05.com.equallogic:0-8a0906-d85f4e007-3f30017ce11505df-ubuntu-tools-hd0,if=virtio,cache=none,aio=native
>>> -m 4096 -smp 2,sockets=1,cores=2,threads=1 -monitor
>>> tcp:0:4002,server,nowait -vnc :2 -qmp tcp:0:3002,server,nowait -name
>>> 'Ubuntu-Tools' -boot order=dc,menu=off -k de -incoming
>>> tcp:172.21.55.34:5002 -pidfile /var/run/qemu/vm-250.pid -mem-path
>>> /hugepages -mem-prealloc -rtc base=utc -usb -usbdevice tablet -no-hpet
>>> -vga cirrus -cpu host,+x2apic,model_id='Intel(R) Xeon(R) CPU
>> Migration with -cpu host is very problemtic, because the source and destination can
>> have different cpu resulting in different cpu features.
>> Does regular migration works with this setup?
>> Can you try with a different cpu type?
>> What are the source and destination /proc/cpuinfo output ?

>
> The CPUs are identical, we also check if flags and cpu types match if cpu type is set to host.
> Regular migration does work.

>
> BR,
> Peter
>
>>
>> Cheers,
>> Orit
>>
>>> L5640 @ 2.27GHz',-tsc
>>>
>>> Thanks,
>>> Peter
>>>
>>>>
>>>> Regards,
>>>> Orit
>>>>>
>>>>> Thanks,
>>>>> Peter
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>
>>>
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>>
>