It’s Time to replace TCP in the Datacenter | The Backend Engineering Show
Skills:
Reading ML Papers90%
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 do have my criticisms of certain aspects of the paper.
It appears there is a path to replace TCP in the datacenter and professor John tries to explain this path.
Timestamps for topics discussed below:
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
01:00:00 Sender Driven Congestion Control
01:03:00 In Order Packet Delivery
01:07:00 DCTCP
01:08:30 Homa is Message Based
01:11:00 Homa is Connection Less
01:12:00 Receiver Driven Congestion Control
01:15:19 Out of Order Packets
01:16:20 Homa API is not Compatible with TCP
01:17:40 Will Homa come to HTTP?
01:18:45 Conclusion
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
Fundamentals of Networking for Effective Backends udemy course (link redirects to udemy with coupon)
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Chapters (27)
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
Homa 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
🎓
Tutor Explanation
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