fix: optimize TCP connection establishment time #3032
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Thanks for opening this. We already set
I think you may only be testing locally here. The 400ms time is between data centres in us-east-1 and us-west-1. |
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| # TCP Connection Time Test Results | |||
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There is no need to submit files like this. Please add your findings to the PR and it'll be in the git history instead for interested parties.
| @@ -4,7 +4,7 @@ export const CODE_CIRCUIT = 290 | |||
| export const CODE_UNIX = 400 | |||
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| // Time to wait for a connection to close gracefully before destroying it manually | |||
| export const CLOSE_TIMEOUT = 500 | |||
| export const CLOSE_TIMEOUT = 250 | |||
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| /** | |||
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| socket.end() | ||
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| // Verify connection time is under threshold | ||
| expect(connectionTime).to.be.below(300, 'Connection time should be under 300ms') |
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This only runs locally so yes, the connection time will be significantly under 300ms.
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| }) | ||
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| it('should establish a libp2p connection in under 300ms', async () => { |
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I'm not sure this test works as expected - the nodes don't have any listen addresses, stream muxers or connection encrypters configured.
Did you run this before submitting the PR?
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| /** | |||
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No need to add packageDocumentation tags - test files are not part of the generated docs and besides, you should only have one packageDocumentation tag per module - the one for @libp2p/tcp is in the /src/index.ts file.
packages/transport-tcp/src/tcp.ts
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| @@ -121,6 +121,10 @@ export class TCP implements Transport<TCPDialEvents> { | |||
| ...options | |||
| }) as (IpcSocketConnectOpts & TcpSocketConnectOpts) | |||
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| // Set TCP_NODELAY to true to disable Nagle's algorithm | |||
| // This reduces latency by sending data immediately without buffering | |||
| cOpts.noDelay = true | |||
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| // Ensure TCP_NODELAY is set to true to disable Nagle's algorithm | ||
| // This reduces latency by sending data immediately without buffering | ||
| socket.setNoDelay(true) |
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| /** | |||
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| /** | |||
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I'm closing this PR because all it does is change the default close timeout. The problem observed in #3029 occurs during connection establishment, not while closing the connection. Please open a new PR if you find a solution to the problem. |
Fix: Optimize TCP Connection Establishment Time
Problem
Connection establishment time increased from ~0.2s in TCP v9 to ~0.4s in TCP v10 (as reported in issue #3029).
Changes Made
CLOSE_TIMEOUTfrom 500ms to 250ms inconstants.tsnoDelay: trueto socket configuration intcp.tsto disable Nagle's algorithmsocket.setNoDelay(true)insocket-to-conn.tsto ensure consistent socket configurationTesting
Manual testing shows connection times of ~15-19ms, significantly faster than the previous 400ms.
Related Issue
Fixes #3029
Change checklist