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There were couple of reports on the list (e.g. [1]) that guests with huge amounts of RAM are unable to start because libvirt kills qemu in the initialization phase. The problem is that if guest is configured to use hugepages kernel has to zero them all out before handing over to qemu process. For instance, 402GiB worth of 1GiB pages took around 105 seconds (~3.8GiB/s). Since we do not want to make the timeout for connecting to monitor configurable, we have to teach libvirt to count with this fact. This commit implements "1s per each 1GiB of RAM" approach as suggested here [2]. 1: https://www.redhat.com/archives/libvir-list/2017-March/msg00373.html 2: https://www.redhat.com/archives/libvir-list/2017-March/msg00405.html Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>