Abstract:
I/O virtualization performance is limited by hypervisor intervention in the virtual I/O event path due to costly VM exits. Hardware-based Posted-Interrupt (PI) technology emerged due to the failures of software solutions to virtual interrupt delivery, a major cause of VM exits.
PI delivers non-exit interrupts without compromising virtualization. It only affects the interrupt path, but guest I/O requests can cause many VM exits. vCPU scheduling may also cause severe interrupt latency for PI. To optimize guest-device bidirectional I/O event delivery, we propose ES2.
Based on PI, ES2 introduces hybrid I/O handling for efficient request delivery and intelligent interrupt redirection for improved responsiveness. Guest OS is unmodified. ES2 reduces I/O-related VM exits, increases guest throughput by 1.9x for Memcached and 1.6x for Nginx, and keeps guest latency low.
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