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Phoenix: A Refactored I/O Stack for GPU Direct Storage Without Phony Buffers
DescriptionGPU Direct Storage (GDS) plays a vital role in GPU storage systems, utilizing P2P-DMA technology to establish a direct data transfer path between the GPU and storage devices. This direct path reduces storage access latency and CPU overhead, thus improving data transfer efficiency. Currently, however, GDS employs a phony buffer in host memory to interact with the Linux kernel, resulting in suboptimal performance, additional resource consumption, and deployment complexity.
In this paper, we propose Phoenix, a refactored GDS software stack without phony buffers. Phoenix employs the memory mapping service of ZONE_DEVICE to map GPU memory into the page table at system startup. The kernel module of Phoenix stores the returned address information, allocates user-space virtual memory, and establishes a mapping with the designated GPU memory. Extensive evaluation shows that, compared to the existing GDS software stack, Phoenix reduces software overhead along the critical I/O path and improves end-to-end performance.
In this paper, we propose Phoenix, a refactored GDS software stack without phony buffers. Phoenix employs the memory mapping service of ZONE_DEVICE to map GPU memory into the page table at system startup. The kernel module of Phoenix stores the returned address information, allocates user-space virtual memory, and establishes a mapping with the designated GPU memory. Extensive evaluation shows that, compared to the existing GDS software stack, Phoenix reduces software overhead along the critical I/O path and improves end-to-end performance.
Event Type
Paper
TimeWednesday, 19 November 20251:52pm - 2:15pm CST
Location275
Data Analytics, Visualization & Storage