Hostping: Diagnosing Intra-host Network Bottlenecks in RDMA Servers


Kefei Liu, BUPT; Zhuo Jiang, ByteDance Inc.; Jiao Zhang, BUPT and Purple Mountain Laboratories; Haoran Wei, BUPT and ByteDance Inc.; Xiaolong Zhong, BUPT; Lizhuang Tan, ByteDance Inc.; Tian Pan and Tao Huang, BUPT and Purple Mountain Laboratories


Intra-host networking was considered robust in the RDMA (Remote Direct Memory Access) network and received little attention. However, as the RNIC (RDMA NIC) line rate increases rapidly to multi-hundred gigabits, the intra-host network becomes a potential performance bottleneck for network applications. Intra-host network bottlenecks may result in degraded intra-host bandwidth and increased intra-host latency, which can severely impact network performance. However, when intra-host bottlenecks occur, they can hardly be noticed due to the lack of a monitoring system. Furthermore, existing bottleneck diagnosis mechanisms fail to diagnose intra-host bottlenecks efficiently. In this paper, we analyze the symptom of intra-host bottlenecks based on our longterm troubleshooting experience and propose Hostping, the first bottleneck monitoring and diagnosis system dedicated to intra-host networks. The core idea of Hostping is conducting loopback tests between RNICs and endpoints within the host to measure intra-host latency and bandwidth. Hostping not only discovers intra-host bottlenecks we already knew but also reveals six bottlenecks we did not notice before.

NSDI '23 Open Access Sponsored by
King Abdullah University of Science and Technology (KAUST)

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@inproceedings {285185,
author = {Kefei Liu and Zhuo Jiang and Jiao Zhang and Haoran Wei and Xiaolong Zhong and Lizhuang Tan and Tian Pan and Tao Huang},
title = {Hostping: Diagnosing Intra-host Network Bottlenecks in {RDMA} Servers},
booktitle = {20th USENIX Symposium on Networked Systems Design and Implementation (NSDI 23)},
year = {2023},
isbn = {978-1-939133-33-5},
address = {Boston, MA},
pages = {15--29},
url = {},
publisher = {USENIX Association},
month = apr
Liu Paper (Prepublication) PDF

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