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There are two functions on the client that handle incoming stream data. The first one virNetClientStreamQueuePacket() is a low level function that just processes the incoming stream data from the socket and stores it into an internal structure. This happens in the client event loop therefore the shorter the callbacks are, the better. The second function virNetClientStreamRecvPacket() then handles copying data from internal structure into a client provided buffer. Change introduced in this commit makes just that: new queue for incoming stream packets is introduced. Then instead of copying data into intermediate internal buffer and then copying them into user buffer, incoming stream messages are queue into the queue and data is copied just once - in the upper layer function virNetClientStreamRecvPacket(). In the end, there's just one copying of data and therefore shorter event loop callback. This should boost the performance which has proven to be the case in my testing. 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>