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problems with live migration using kvm-84

DISCUSSION Gerrit Slomma 2 participants 5 messages Mar 28, 2009 – Mar 31, 2009 KVM

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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.

#1 lore raw
Quoted 3 lines · Gerrit Slomma

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?

Signature · 2 lines
Tomasz Chmielewski
http://wpkg.org
#2 lore raw
Quoted 10 lines · Tomasz Chmielewski <mangoo <at> wpkg.org> writes:
Quoted 3 lines · Gerrit Slomma

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

#4 lore raw
Quoted 3 lines · 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