[pve-devel] qemu kvm_steal_time bug

[Alexandre DERUMIER]

Hi,

I have add this bug, which occur after live migration:

https://code.google.com/p/ganeti/issues/detail?id=986
https://groups.google.com/forum/#!topic/ganeti/D2Yos3BShmc
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=785557#64


qemu 2.4 or 2.1  and guest kernel 3.16 (debian jessie).


The bug is that after a live migration, the steal cpu counter just freeze at 100%

# mpstat
Linux 3.16.0-4-amd64 (radinsapi1) 	28/08/2015 	_x86_64_	(8 CPU)

16:24:51     CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal  %guest  %gnice   %idle
16:24:51     all    0,00    0,00    0,00    0,00    0,00    0,00   99,92    0,00    0,00    0,08


Seem to be a qemu bug, the workaround seem to use -kvm_steal_time  cpu flag.
But I don't known if they are an performance impact or not.

Does somebody already have had this bug ?

Alexandre