Many devices such as accelerators, storage appliances, video transcoding accelerators, etc. have asymmetric bandwidth requirements. For example, the ingress bandwidth for a machine learning accelerator can be more than ten times the egress bandwidth. However, this asymmetry in bandwidth is not reflected in the interconnect. For example, PCI-express typically has as many lanes for host-to-device communications as it does for device-to-host communications. This disclosure presents techniques for asymmetric links between host and device. By reflecting the relative magnitudes of to-and-fro traffic more accurately, the asymmetric PCIe link achieves greater efficiency of communication.
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Patil, Nishant, "Asymmetric PCIe", Technical Disclosure Commons, (December 19, 2018)