[pve-devel] qemu kvm_steal_time bug

[Stefan Priebe - Profihost AG]

Is it only with 3.16 kernel? Haven't seen this yet.

Stefan

Excuse my typo sent from my mobile phone.

> Am 28.08.2015 um 16:31 schrieb Alexandre DERUMIER <aderumier at odiso.com>:
> 
> 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
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