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While connecting to qemu monitor, the first thing we do is wait for it to show up. However, we are doing it with some timeout to avoid indefinite waits (e.g. when qemu doesn't create the monitor socket at all). After beaa447a29 we are using exponential back off timeout meaning, after the first connection attempt we wait 1ms, then 2ms, then 4 and so on. This allows us to bring down wait time for small domains where qemu initializes quickly. However, on the other end of this scale are some domains with huge amounts of guest memory. Now imagine that we've gotten up to wait time of 15 seconds. The next one is going to be 30 seconds, and the one after that whole minute. Well, okay - with current code we are not going to wait longer than 30 seconds in total, but this is going to change in the next commit. The exponential back off is usable only for first few iterations. Then it needs to be caped (one second was chosen as the limit) and switch to constant wait time. 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>