Subject: [tsvwg] LDCP: A PFC-Free Congestion Control for high speed data-center networks

From: daihuichen <[email-masked]>
Date: Tue, 14 Jul 2020 06:44:50 +0000

Hello Folks,

Our team has worked on a congestion control algorithm that is able to turn off PFC in high speed data-center networks.
We have posted an initial draft today that can be found at https://www.ietf.org/internet-drafts/draft-dai-tsvwg-pfc-free-congestion-control-00.txt 

We would like to hear your comments and feedbacks.

Best regards,
Huichen

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On Monday, July 13, 2020 10:53 PM, [email-masked] [mailto:[email-masked]] wrote: 

A new version of I-D, draft-dai-tsvwg-pfc-free-congestion-control-00.txt
has been successfully submitted by Huichen Dai and posted to the IETF repository.

Name:		draft-dai-tsvwg-pfc-free-congestion-control
Revision:	00
Title:		PFC-Free Low Delay Control Protocol
Document date:	2020-07-13
Group:		Individual Submission
Pages:		11
URL:            https://www.ietf.org/internet-drafts/draft-dai-tsvwg-pfc-free-congestion-control-00.txt
Status:         https://datatracker.ietf.org/doc/draft-dai-tsvwg-pfc-free-congestion-control/
Htmlized:       https://tools.ietf.org/html/draft-dai-tsvwg-pfc-free-congestion-control-00
Htmlized:       https://datatracker.ietf.org/doc/html/draft-dai-tsvwg-pfc-free-congestion-control

Abstract:
   Today, low-latency transport protocols like RDMA over Converged
   Ethernet (RoCE) can provide good delay and throughput performance in
   small and lightly loaded high-speed datacenter networks due to
   lossless transport based on priority-based flow control (PFC).
   However, PFC suffers from various issues from performance degradation
   and unreliability (e.g., deadlock), limiting the deployment of RoCE
   to only small scale clusters (~1000).

   This document presents LDCP, a new transport that scales loss-
   sensitive transports, e.g., RDMA, to entire data-centers containing
   tens of thousands machines, without dependency on PFC for
   losslessness, i.e., PFC-free.  LDCP develops a novel end-to-end
   congestion control scheme and achieves very low queue occupancy even
   under high network utilization or large traffic churns, resulting in
   almost no packet loss.  Meanwhile, LDCP allows a new flow to jump
   start at full speed at the very beginning and therefore minimizes the
   latency for short RPC-style transactions.  LDCP relies on only WRED
   and ECN, two widely supported features on switches, so it can be
   easily deployed in existing network infrastructures.  Finally, LDCP
   is simple by design and thus can be easily implemented by
   programmable or ASIC NICs.

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