Behnam Montazeri, Yilong Li, Mohammad Alizadeh, John Ousterhout
SIGCOMM, Budapest, Hungary, August 2018
Homa is a new transport protocol for datacenter networks. It provides
exceptionally low latency, especially for workloads with
a high volume of very short messages, and it also supports large
messages and high network utilization. Homa uses in-network
priority queues to ensure low latency for short messages; priority
allocation is managed dynamically by each receiver and integrated
with a receiver-driven flow control mechanism. Homa
also uses controlled overcommitment of receiver downlinks to
ensure efficient bandwidth utilization at high load. Our implementation
of Homa delivers 99th percentile round-trip times
less than 15 µs for short messages on a 10 Gbps network running
at 80% load. These latencies are almost 100x lower than the best
published measurements of an implementation. In simulations,
Homa’s latency is roughly equal to pFabric and significantly
better than pHost, PIAS, and NDP for almost all message sizes
and workloads. Homa can also sustain higher network loads
than pFabric, pHost, or PIAS.
[PDF (542KB)]
Bibtex Entry:
@inproceedings{montazeri2018homa,
author = "Behnam Montazeri and Yilong Li and Mohammad Alizadeh and John Ousterhout",
title = "{Homa: A Receiver-Driven Low-Latency Transport Protocol Using Network Priorities}",
booktitle = {SIGCOMM},
year = {2018},
month = {August},
address = {Budapest, Hungary}
}