BSDCan2015 - ZI

BSDCan 2015
The Technical BSD Conference

Midori Kato
Day Talks #2 - 13 June - 2015-06-13
Room DMS 1120
Start time 15:00
Duration 01:00
ID 559
Event type Lecture
Track Hacking
Language used for presentation English

Extensions to FreeBSD Datacenter TCP for Incremental Deployment Support

Datacenter TCP (DCTCP) achieves low latencies for short flows while maintaining high throughputs for concurrent bulk transfers, but requires changes to both endpoints, which presents a deployment challenge. This presentation introduces extensions to DCTCP that enables one-sided deployment when peers implement standard TCP/ECN functionality.

This makes DCTCP significantly easier to deploy incrementally. We also improve DCTCP in two-sided deployments by refining ECN processing and the calculation of the congestion estimate.

A FreeBSD kernel implementation of these DCTCP improvements demonstrates better performance than the original DCTCP variant, and validates that incremental one-sided deployments see benefits similar to those previously only achievable in two-sided deployments.