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ERTDS: A dynamic CPU scheduler for Xen virtualization systems

Real-time deferrable server (RTDS) scheduler is presented since Xen 4.5. Under RTDS, a guaranteed physical CPU capacity is provided to every virtual CPU so that the performance can be better predicted. However, the guaranteed capacity is defined off-line, it might not fit the requirement of a virtual CPU at the run-time. In this paper, an RTDS-based CPU scheduler is proposed, called enhanced real-time deferrable server (ERTDS), to provide an additional capacity to virtual CPUs when their run-time requirements are higher than expected. The proposed ERTDS has been implemented in Xen 4.7 and a series of experiments has been conducted for which we have some encouraging results.