Re: [Qemu-devel] [pve-devel] QEMU LIve Migration - swap_free: Bad swap file entry

[Stefan Priebe - Profihost AG]

Hi,

Am 07.02.2014 14:15, schrieb Dr. David Alan Gilbert:
> * Stefan Priebe - Profihost AG (address@hidden) wrote:
>> Hi,
>>
>> Am 07.02.2014 14:08, schrieb Dr. David Alan Gilbert:
>>> * Stefan Priebe - Profihost AG (address@hidden) wrote:
> 
>>>> first of all i've now a memory image of a VM where i can reproduce it.
>>>> reproducing does NOT work if i boot the VM freshly i need to let it run
>>>> for some hours.
>>>>
>>>> Then just when the migration finishes there is a short time frame where
>>>> the google stress app reports memory errors than when the migration
>>>> finishes it runs fine again.
>>>>
>>>> It seems to me it is related to pause and unpause/resume?
>>>
>>> But do you have to pause/resume it to cause the error? Have you got cases
>>> where you boot it and then leave it running for a few hours and then it 
>>> fails if you migrate it?
>>
>> Yes but isn't migration always a pause / unpause at the end? I thought
>> migration_downtime is the value a very small pause unpause is allowed.
> 
> There's a heck of a lot of other stuff that goes on in migration, and that
> downtime isn't quite the same.
> 
> If it can be reproduced with just suspend/resume stuff then that's a different
> place to start looking than if it's migration only.

ah OK now i got it. No i can't reproduce with suspend resume. But while
migrating it happens directly at the end when the switch from host a to
b happens.

> Dave
> --
> Dr. David Alan Gilbert / address@hidden / Manchester, UK
>