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Virtualization improves resource efficiency and ensures security andperformance isolation for cloud applications. To that end, operators today usea layered architecture that runs a separate network stack instance in each VMand container connected to a separate virtual switch. Decoupling throughlayering reduces complexity, but induces performance and resource overheadsthat are at odds with increasing demands for network bandwidth, communicationrequirements for large distributed applications, and low latency.  We present Virtuoso, a new software networking stack for VMs and containers.Virtuoso performs a fundamental re-organization of the networking stack tomaximize CPU utilization, enforce isolation, and minimize networking stackoverheads. We maximize utilization by running one elastically shared networkstack instance on dedicated cores; we enforce isolation by performing centraland fine-grained per-packet resource accounting and scheduling; we reduceoverheads by building a single-layer data path with a one-shot fast-pathincorporating all processing from the TCP transport layer through networkvirtualization and virtual switching. Virtuoso improves resource utilization byup to 50%, latencies by up to 42% compared to other virtualized network stackswithout sacrificing isolation, and keeps processing overhead within 11.5% ofunvirtualized network stacks.

Virtuoso: High Resource Utilization and {\mu}s-scale Performance Isolation in a Shared Virtual Machine TCP Network Stack