Xen and the art of virtualization
SOSP '03 Proceedings of the nineteenth ACM symposium on Operating systems principles
Task-aware virtual machine scheduling for I/O performance.
Proceedings of the 2009 ACM SIGPLAN/SIGOPS international conference on Virtual execution environments
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Proceedings of the 15th annual international conference on Mobile computing and networking
Device driver isolation within virtualized embedded platforms
CCNC'09 Proceedings of the 6th IEEE Conference on Consumer Communications and Networking Conference
Supporting soft real-time tasks in the xen hypervisor
Proceedings of the 6th ACM SIGPLAN/SIGOPS international conference on Virtual execution environments
The OKL4 microvisor: convergence point of microkernels and hypervisors
Proceedings of the first ACM asia-pacific workshop on Workshop on systems
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This paper addresses the I/O latency issue within Xen-ARM. Although Xen-ARM's split driver presents reliable driver isolation, it requires additional inter-VM scheduling. Consequently, the credit scheduler within Xen-ARM results in unsatisfactory I/O latency for real-time guest OS. This paper analyzes the I/O latency in Xen-ARM's interrupt path, and proposes a new scheduler to bound I/O latency. Our scheduler dynamically assigns priorities to guest OSs so that Xen-ARM ensures to schedule the most urgent task within the system. The experimental results show that Xen-ARM with our new scheduler reduces delay spikes, latency larger than 1ms, from 16% to 1% while retaining the split driver model.