[tsvwg] LDCP: A PFC-Free Congestion Control for high speed data-center networks
daihuichen <daihuichen@huawei.com> Tue, 14 July 2020 06:44 UTC
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From: daihuichen <daihuichen@huawei.com>
To: "tsvwg@ietf.org" <tsvwg@ietf.org>
Thread-Topic: LDCP: A PFC-Free Congestion Control for high speed data-center networks
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Date: Tue, 14 Jul 2020 06:44:50 +0000
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Subject: [tsvwg] LDCP: A PFC-Free Congestion Control for high speed data-center networks
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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 ---------------------------------------- On Monday, July 13, 2020 10:53 PM, internet-drafts@ietf.org [mailto:internet-drafts@ietf.org] 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. Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. The IETF Secretariat