@inproceedings{12b8373de4f54d3fb4dadbe3a4062948,
title = "Understanding host interconnect congestion",
abstract = "We present evidence and characterization of host congestion in production clusters: adoption of high-bandwidth access links leading to emergence of bottlenecks within the host interconnect (NIC-to-CPU data path). We demonstrate that contention on existing IO memory management units and/or the memory subsystem can significantly reduce the available NIC-to-CPU bandwidth, resulting in hundreds of microseconds of queueing delays and eventual packet drops at hosts (even when running a state-of-the-art congestion control protocol that accounts for CPU-induced host congestion). We also discuss implications of host interconnect congestion to design of future host architecture, network stacks and network protocols.",
keywords = "congestion control, datacenter transport, network hardware",
author = "Saksham Agarwal and Rachit Agarwal and Behnam Montazeri and Masoud Moshref and Khaled Elmeleegy and Luigi Rizzo and {De Kruijf}, {Marc Asher} and Gautam Kumar and Sylvia Ratnasamy and David Culler and Amin Vahdat",
note = "Publisher Copyright: {\textcopyright} 2022 Owner/Author.; 21st ACM Workshop on Hot Topics in Networks, HotNets 2022 ; Conference date: 14-11-2022 Through 15-11-2022",
year = "2022",
month = nov,
day = "14",
doi = "10.1145/3563766.3564110",
language = "English (US)",
series = "HotNets 2022 - Proceedings of the 2022 21st ACM Workshop on Hot Topics in Networks",
publisher = "Association for Computing Machinery",
pages = "198--204",
booktitle = "HotNets 2022 - Proceedings of the 2022 21st ACM Workshop on Hot Topics in Networks",
address = "United States",
}