FastLane: An Agile Congestion Signaling Mechanism for Improving Datacenter Performance
Abstract
The drive towards richer, more interactive content places increasingly stringent latency requirements on datacenters. A critical component of meeting these is ensuring that the network responds agilely to congestion, bounding network latency and improving high-percentile flow completion times. We propose a new approach to rapidly detecting and responding to congestion. We introduce FastLane, a congestion signaling mechanism that allows senders to respond more quickly. By delivering signals to senders with high probability and low latency, FastLane allows them to retransmit packets sooner, avoiding resource-wasting timeouts. It also enables senders to make more informed decisions by differentiating between out-of-order delivery and packet loss. We demonstrate through simulation and implementation that FastLane reduces high-percentile flow completion times by over 80% by effectively managing congestion hot-spots. These benefits come at minimal cost-FastLane consumes no more than 2% of bandwidth and 5% of buffers.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 20, 2013
- Accession Number
- ADA587047
Entities
People
- Amin Vahdat
- Anand P. Iyer
- David Zats
- Ion Stoica
- Randy H. Katz
Organizations
- University of California, Berkeley