FastLane: Agile Drop Notification for Datacenter Networks

The drive towards richer and more interactive web content places increasingly stringent requirements on datacenter networks. The speed with which such networks respond to packet drops limits their ability to meet high-percentile flow completion time SLOs. Indirect notifications to packet drops (e.g....

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	Zats, David, Iyer, Anand P, Ananthanarayanan, Ganesh, Katz, Randy H, Stoica, Ion, Vahdat, Amin
Format:	Report
Sprache:	eng
Schlagworte:	AGILE DROP NOTIFICATION BANDWIDTH BANDWIDTH CAPS BUFFER CAPS BUFFER STORAGE CLIENT SERVER SYSTEMS COMMUNICATIONS PROTOCOLS COMMUNICATIONS TRAFFIC Computer Systems COMPUTERIZED SIMULATION CONGESTION DATACENTER NETWORKS DELAY DIRECT NOTIFICATION FASTLANE DROP NOTIFICATION ICMP SOURCE QUENCH IN-NETWORK DROP NOTIFICATION INDIRECT NOTIFICATION INTERNET LOSSES MODIFICATION Non-radio Communications NOTIFICATION PRIORITIZATION OUT-OF-ORDER DELIVERIES PACKET DROPS PACKET LOSSES PACKET SWITCHING PFABRIC QUANTIZED CONGESTION NOTIFICATION QUICK PACKET RETRANSMISSION QUICK REACTION Radio Communications RATE THROTTLING SCENARIOS SHORT FLOW COMPLETION TIMES SOURCES TCP Telemetry TEST AND EVALUATION TIMELINESS TIMEOUTS TRANSPORT HEADER INCLUSION TRANSPORT MODIFICATIONS
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	The drive towards richer and more interactive web content places increasingly stringent requirements on datacenter networks. The speed with which such networks respond to packet drops limits their ability to meet high-percentile flow completion time SLOs. Indirect notifications to packet drops (e.g., duplicates in an end-to-end acknowledgment sequence) are an important limitation to the agility of response to packet drops. We propose FastLane, a new in-network drop notification mechanism. FastLane enhances switches to send high-priority per-flow drop notifications to sources, thus informing sources as quickly as possible. Consequently, sources can retransmit packets sooner and throttle transmission rates earlier. Sources also can make better decisions, given more precise information and the ability to differentiate between out-of-order delivery and packet loss. We demonstrate, through simulation and implementation, that FastLane reduces 99.9th percentile completion times of short flows by up to 75%. These benefits come at minimal cost -- safeguards ensure that FastLane consumes no more that 1% of bandwidth and 2.5% of buffers.