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

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Stefan Priebe - Profihost AG (s.priebe@profihost.ag) wrote:
> Am 07.02.2014 09:15, schrieb Alexandre DERUMIER:
> > 
> > do you use xbzrle for live migration ?
> 
> no - i'm really stucked right now with this. Biggest problem i can't
> reproduce with test machines ;-(

Only being able to test on your production VMs isn't fun;
is it possible or you to run an extra program on these VMs - e.g.
if we came up with a simple (userland) memory test?

Dave

> 
> Stefan
> 
> 
> > 
> > ----- Mail original ----- 
> > 
> > De: "Stefan Priebe" <s.priebe@profihost.ag> 
> > À: "Dr. David Alan Gilbert" <dgilbert@redhat.com> 
> > Cc: "Alexandre DERUMIER" <aderumier@odiso.com>, "qemu-devel" <qemu-devel@nongnu.org> 
> > Envoyé: Jeudi 6 Février 2014 21:00:27 
> > Objet: Re: [Qemu-devel] [pve-devel] QEMU LIve Migration - swap_free: Bad swap file entry 
> > 
> > Hi, 
> > Am 06.02.2014 20:51, schrieb Dr. David Alan Gilbert: 
> >> * Stefan Priebe - Profihost AG (s.priebe@profihost.ag) wrote: 
> >>> some more things which happen during migration: 
> >>>
> >>> php5.2[20258]: segfault at a0 ip 0000000000740656 sp 00007fff53b694a0 
> >>> error 4 in php-cgi[400000+6d7000] 
> >>>
> >>> php5.2[20249]: segfault at c ip 00007f1fb8ecb2b8 sp 00007fff642d9c20 
> >>> error 4 in ZendOptimizer.so[7f1fb8e71000+147000] 
> >>>
> >>> cron[3154]: segfault at 7f0008a70ed4 ip 00007fc890b9d440 sp 
> >>> 00007fff08a6f9b0 error 4 in libc-2.13.so[7fc890b67000+182000] 
> >>
> >> OK, so lets just assume some part of memory (or CPU state, or memory 
> >> loaded off disk...) 
> >>
> >> You said before that it was happening on a 32GB image - is it *only* 
> >> happening on a 32GB or bigger VM, or is it just more likely? 
> > 
> > Not image, memory. I've only seen this with vms having more than 16GB or 
> > 32GB memory. But maybe this also indicates that just the migration takes 
> > longer. 
> > 
> >> I think you also said you were using 1.7; have you tried an older 
> >> version - i.e. is this a regression in 1.7 or don't we know? 
> > Don't know. Sadly i cannot reproduce this with test VMs only with 
> > production ones. 
> > 
> > Stefan 
> > 
> >> Dave 
> >> -- 
> >> Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK 
> >>
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK