Oct 25 – 29, 2021
Europe/Zurich timezone

The RX Extended SACK Table Proposal - AuriStor RX Prototype Results

Oct 27, 2021, 5:50 PM
25m
Online workshop

Online workshop

Storage & Filesystems Storage & File Systems

Speaker

Mr Jeffrey Altman

Description

The RX protocol inherited from IBM AFS is incapable of filling a network pipe with a single RPC when the pipe's bandwidth delay product exceeds 44 1/4 KB. On a 1 Gbit/sec pipe with a 1ms RTT, the maximum theoretical throughput is 360 Mbit/sec with a maximum window size of 44 KB. The RX ACK packet format provides for a theoretical maximum window of 65535 packets but the Selective Acknowledgment (SACK) Table is limited to 255 packets. with 255 packets the maximum window size is 351 KB or maximum throughput of 2.875 Gbit/sec with 1ms RTT. Increase the RTT to 8ms and the maximum throughput is once again reduced to 360 Mbit/sec. The RTT on cross-Atlantic commodity internet pipes often exceed 110ms which reduces the theoretical throughput to 28 MBit/sec.

This presentation will describe AuriStor's proposed RX Extended SACK Table protocol extension, prior efforts at extending the maximum window size, and preliminary results on real-world networks using AuriStor's prototype supporting maximum windows up to 8192 packets or 11MB.

Desired slot length 20 minutes
Speaker release Yes

Primary author

Presentation materials