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

[Stefan Priebe <s.priebe@profihost.ag>]

Am 13.02.2014 21:06, schrieb Dr. David Alan Gilbert:
> * Stefan Priebe (s.priebe@profihost.ag) wrote:
>> Am 10.02.2014 17:07, schrieb Dr. David Alan Gilbert:
>>> * Stefan Priebe (s.priebe@profihost.ag) wrote:
>>>> i could fix it by explicitly disable xbzrle - it seems its
>>>> automatically on if i do not set the migration caps to false.
>>>>
>>>> So it seems to be a xbzrle bug.
>>>
>>> Stefan can you give me some more info on your hardware and
>>> migration setup;   that stressapptest (which is a really nice
>>> find!) really batters the memory and it means the migration
>>> isn't converging for me, so I'm curious what your setup is.
>>
>> That one is devlopment by google and known to me since a few years.
>> Google has detected that memtest and co are not good enough to
>> stress test memory.
>
> Hi Stefan,
>    I've just posted a patch to qemu-devel that fixes two bugs that
> we found; I've only tried a small stressapptest run and it seems
> to survive with them (where it didn't before);  you might like to try
> it if you're up for rebuilding qemu.
>
> It's the one entitled ' [PATCH] Fix two XBZRLE corruption issues'
>
> I'll try and get a larger run done myself, but I'd be interested to
> hear if it fixes it for you (or anyone else who hit the problem).

Yes works fine - now no crash but it's sower than without XBZRLE ;-)

Without XBZRLE: i needed migrate_downtime 4 around 60s
With XBZRLE: i needed migrate_downtime 16 and 240s


> Dave
> --
> Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
>