DAQS: Dynamic and Accurate QoS for SR-IOV

Single Root Input/Output Virtualization (SR-IOV) is a key feature in the PCI Express (PCIe) specifications, which facilitates the shared use of the same device in a virtualized environment by different virtual machines (VMs) and enables network traffic to bypass the usual virtualization stack, reducing interference among Virtual Functions (VFs). However, guaranteeing Quality of Service (QoS) as mandated by Service Level Agreements (SLAs) in these environments is challenging due to the host stack bypassing. This paper discusses these challenges and proposes an approach to ensure accurate QoS in SR-IOV environments by monitoring and regulating traffic from the host side through QEMU Guest Agent. The proposed approach automatically manages active VFs to meet SLA while fully utilizing the host bandwidth.