problems with live migration using kvm-84

problems with live migration using kvm-84

[Gerrit Slomma]

Hello and good day.

I have filed a bug report via bugzilla.redhat.com with the id
Any ideas about this?
It is urgent to resolve the problem, otherwise i am urged by my company 
to use vmware for virtualization.
But vmware is not wanted by the admins (like me).

Kind regards Gerrit Slomma.

Re: problems with live migration using kvm-84

[Tomasz Chmielewski]

Gerrit Slomma schrieb:
> Hello and good day.
> 
> I have filed a bug report via bugzilla.redhat.com with the id

With what ID?

Could you give the full URL?


-- 
Tomasz Chmielewski
http://wpkg.org

Re: problems with live migration using kvm-84

[Gerrit Slomma]

Tomasz Chmielewski <mangoo <at> wpkg.org> writes:

> 
> Gerrit Slomma schrieb:
> > Hello and good day.
> > 
> > I have filed a bug report via bugzilla.redhat.com with the id
> 
> With what ID?
> 
> Could you give the full URL?
> 

Sorry, my fault.
Full URL is:

https://bugzilla.redhat.com/show_bug.cgi?id=492688

Problem is described there but for the lazy i copy-paste it here:

Virtual machine gets stuck after migration. One CPU is 100% load, other one
idles. The virtual machine could be pinged, ssh-login is not always possible.
If stopped on migration target and continued on migration-source the virtual
machine recovers after some time without load.

Version-Release number of selected component (if applicable):

kvm-84-1.el5.x86_64.rpm
kvm-kmod-84-1.el5.x86_64.rpm
qemu-0.9.1-11.el5.x86_64.rpm
qemu-img-0.9.1-11.el5.x86_64.rpm

kvm and kvm-kmod compiled from sourceforge sources and installed from built
rpm, qemu and qemu-img are from EPEL-repository

How reproducible:

Start a kvm-virtual-machine on host A, start a kvm-virtual-machine with the
same parameters on host B in incoming-Mode. Migrate the virtual-machine from
host A to host B. Watch the kvm-process go to 100% after migration finishs.
Maybe you have to wait up to 5 seconds or apply a ls or such in the virtual
machine. After stopping virtual machine on host B and continuing virtual
machine on host A the virtual machine recovers

Re: problems with live migration using kvm-84

[Gerrit Slomma]

I updated my bugreport at https://bugzilla.redhat.com/show_bug.cgi?id=492688#c8
When migrating with -no-kvm everything works fine without stacktraces.

Re: problems with live migration using kvm-84

[Gerrit Slomma]

Gerrit Slomma <roadrunner_gs <at> web.de> writes:

> 
> I updated my bugreport at https://bugzilla.redhat.com/show_bug.cgi?id=492688#c8
> When migrating with -no-kvm everything works fine without stacktraces.

Seems like -no-kvm is emulating a AMD on my Intel-Hosts...

host

rr016# grep vendor_id /proc/cpuinfo
vendor_id       : GenuineIntel
vendor_id       : GenuineIntel

virtual machine

rr019v4#  grep vendor_id /proc/cpuinfo
vendor_id       : AuthenticAMD
vendor_id       : AuthenticAMD

host

rr017# grep vendor_id /proc/cpuinfo
vendor_id       : GenuineIntel
vendor_id       : GenuineIntel

virtual machine

rr019v4#  grep vendor_id /proc/cpuinfo
vendor_id       : AuthenticAMD
vendor_id       : AuthenticAMD

whereas without -no-kvm it is Intel

virtual machine

rr019v4# grep vendor_id /proc/cpuinfo
vendor_id       : GenuineIntel
vendor_id       : GenuineIntel