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Replacing TCP for the Datacenter - Discussing the Homa paper
In this episode of the backend engineering show I go through and discuss the Homa Protocol paper which attempts to replace TCP as a protocol in the data centers. I learned a lot from this paper, I have my criticisms of certain aspects, timestamps for topics discussed below.
It appears there is a path to replace TCP in the datacenter and professor John tries to explain this path.
Referenced materials mentioned in the episode
Overview paper
https://web.stanford.edu/~ouster/cgi-bin/papers/replaceTcp.pdf
Homa 2018 paper (Details)
https://people.csail.mit.edu/alizadeh/papers/homa-sigcomm18.pdf
NIC Offloading in Linux
https://en.wikipedia.org/wiki/TCP_offload_engine#Support_in_Linux
Curl disabling Nigel Algo
https://github.com/curl/curl/commit/4732ca5724072f132876f520c8f02c7c5b654d9
0:00 Intro
3:00 The nature of networking data center
5:30 TCP Segments
7:30 There is no “Request” in TCP
12:00 What so unique about Data centers?
14:00 Message Throughput vs Data throughput
18:25 Congestion Control
22:38 Homa’s Congestion Control
25:00 Server Core Load Balancing
28:30 NIC offloading
30:00 Everything Wrong about TCP
37:00 Why not QUIC?
40:00 Limitation of Streaming
44:10 Load Balancing Stream Reading
47:15 Can we treat Segments as Messages?
51:00 Dispatching Messages is Easier
53:00 Connection Orientation
1:00:00 Sender Driven Congestion Control
1:03:00 In Order Packet Delivery
1:07:00 DCTCP
1:08:30 Homa is Message Based
1:11:00 Home is Connection Less
1:12:00 Receiver Driven Congestion Control
1:15:19 Out of Order Packets
1:16:20 Homa API is not Compatible with TCP
1:17:40 Will Homa come to HTTP?
1:18:45 Conclusion
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