Fair Unidirectional Multi-Queue VM Migration

The patent segments the migration data transfer into multiple unidirectional streams (fronting stream, paging stream, log stream, etc.) instead of using a single bidirectional TCP connection. Each stream operates independently with its own flow control, allowing parallel data transfer that bypasses the limitations of traditional TCP flow control while maintaining reliability through individual stream management.

The patent inverts the traditional bidirectional TCP communication model into multiple unidirectional streams. By eliminating the need for acknowledgments and error handling in the reverse direction, the system removes TCP processing overhead and potential error disruptions, achieving faster and more reliable data transfer without the bottlenecks of conventional TCP error handling.

The patent applies preliminary action by establishing a predefined stream hierarchy and ordering rules before migration begins. The fronting stream is designated to carry the most critical updates with highest priority, followed by paging stream, log stream, and other streams in a predetermined sequence. This pre-established ordering framework simplifies the complexity of managing multiple streams during migration, as the destination hypervisor can automatically process updates in the correct sequence without complex real-time coordination.