Titan: Fair Packet Scheduling for Commodity Multiqueue NICs
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Date
2017-02-07Author
Stephens, Brent
Singhvi, Arjun
Akella, Aditya
Swift, Michael
Metadata
Show full item recordAbstract
The performance of an OS’s networking stack can be
measured by its achieved throughput, CPU utilization,
latency, and per-flow fairness. To be able to drive increasing
line-rates at 10Gbps and beyond, modern OS
networking stacks rely on a number of important hardware
and software optimizations, including but not limited
to using multiple transmit and receive queues and
segmentation offloading. Unfortunately, it not clear how
best to leverage these optimizations to extract performance.
The first contribution of this paper is a detailed
empirical study of the impact of different OS and NIC
configurations on this four-dimensional trade-off space.
We find that enabling certain specific features is crucial
for latency, CPU utilization, and throughput. However,
substantial flow-level unfairness still remains. The
second contribution of this paper is Titan, an extension
to the Linux networking stack that systematically addresses
unfairness arising in different operating conditions,
while minimally impacting CPU utilization, latency,
and throughput.
Subject
Network Fairness
Multiqueue NIC
Permanent Link
http://digital.library.wisc.edu/1793/75739Citation
TR1840