Skip to contentSkip to conversation

qemu/qemu-kvm-0.12.1.2 - migration still very slow

DISCUSSION Nikola Ciprich 2 participants 2 messages Dec 30, 2009 – Dec 31, 2009 KVM

lore
Share & tools
lore
#0 lore raw

Hi,
few months ago Pierre Riteau reported regression of exec migration in qemu.
(http://lists.gnu.org/archive/html/qemu-devel/2009-08/msg01557.html)
There was some discussion, but there is no clear conclusion. Today, I tried qemu-kvm-0.12.1.2 and migration is still very slow (using libvirt save command, which internaly uses migration) to suspend vm with 4GB of ram can take almost half an hour, although system is not loaded at all.
Is there some way to speed things up?
Any tips would be greatly appreciated...
with best regards
nik

Signature · 14 lines
-------------------------------------
Nikola CIPRICH
LinuxBox.cz, s.r.o.
28. rijna 168, 709 01 Ostrava

tel.:   +420 596 603 142
fax:    +420 596 621 273
mobil:  +420 777 093 799

www.linuxbox.cz

mobil servis: +420 737 238 656
email servis: [email protected]
-------------------------------------
#1 lore raw
Quoted 9 lines · Nikola Ciprich

Hi,
few months ago Pierre Riteau reported regression of exec migration in qemu.
(http://lists.gnu.org/archive/html/qemu-devel/2009-08/msg01557.html)
There was some discussion, but there is no clear conclusion. Today, I tried qemu-kvm-0.12.1.2 and migration is still very slow (using libvirt save command, which internaly uses migration) to suspend vm with 4GB of ram can take almost half an hour, although system is not loaded at all.
Is there some way to speed things up?

I haven't had time to debug this further. The only workaround I found is to put some load in the guest (e.g. yes > /dev/null).

Signature · 1 line
Pierre Riteau -- http://perso.univ-rennes1.fr/pierre.riteau/