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Micro-CLK: returning to the asynchronicity with communication-less microkernel

Inter-process communication (IPC) has always been the "Achilles heel" of microkernels, determining their overall performance. The entire history of microkernel development is tightly coupled to the debates about IPC, its efficiency, and the bottleneck it creates. The microkernel research community has consistently viewed the idea of message passing as the fundamental foundation of the microkernel, which is considered linked to its design inextricably. We are revising the place of IPC in the microkernel-based multi-server operating system design. We argue that communication can and potentially should be moved out to the userspace making microkernel the first tier resource manager solely. We describe a novel approach to out-of-kernel asynchronous messaging in multi-server microkernel OS and provide preliminary evaluation results to show its benefits.