[libvirt-users] Real time threads don't work in libvirt containers under CentOS 7.3

[Daniel P. Berrange]

On Mon, Feb 06, 2017 at 09:32:29AM -0800, Peter Steele wrote:
> We've been using libvirt based containers under CentOS 7 and everything has
> been working fine. One application we run in our containers is ctdb, which
> uses SCHED_FIFO (real time) threads. This has been working without problems
> until our recent upgrade to CentOS 7.3. For some reason, ctdb is no longer
> able to create real time threads, and I've tried a simple program myself
> that confirms this. The same program works fine on the hypervisor so I know
> the kernel supports real time. Does anyone know what may have changed in
> CentOS 7.3 that breaks real time threads in libvirt containers?

If I had to guess, perhaps some tunable in cgroups is denying execution
time ?


Regards,
Daniel
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