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Aaro Altonen
80616f6d03
[litep2p](https://github.com/altonen/litep2p) is a libp2p-compatible P2P networking library. It supports all of the features of `rust-libp2p` that are currently being utilized by Polkadot SDK. Compared to `rust-libp2p`, `litep2p` has a quite different architecture which is why the new `litep2p` network backend is only able to use a little of the existing code in `sc-network`. The design has been mainly influenced by how we'd wish to structure our networking-related code in Polkadot SDK: independent higher-levels protocols directly communicating with the network over links that support bidirectional backpressure. A good example would be `NotificationHandle`/`RequestResponseHandle` abstractions which allow, e.g., `SyncingEngine` to directly communicate with peers to announce/request blocks. I've tried running `polkadot --network-backend litep2p` with a few different peer configurations and there is a noticeable reduction in networking CPU usage. For high load (`--out-peers 200`), networking CPU usage goes down from ~110% to ~30% (80 pp) and for normal load (`--out-peers 40`), the usage goes down from ~55% to ~18% (37 pp). These should not be taken as final numbers because: a) there are still some low-hanging optimization fruits, such as enabling [receive window auto-tuning](https://github.com/libp2p/rust-yamux/pull/176), integrating `Peerset` more closely with `litep2p` or improving memory usage of the WebSocket transport b) fixing bugs/instabilities that incorrectly cause `litep2p` to do less work will increase the networking CPU usage c) verification in a more diverse set of tests/conditions is needed Nevertheless, these numbers should give an early estimate for CPU usage of the new networking backend. This PR consists of three separate changes: * introduce a generic `PeerId` (wrapper around `Multihash`) so that we don't have use `NetworkService::PeerId` in every part of the code that uses a `PeerId` * introduce `NetworkBackend` trait, implement it for the libp2p network stack and make Polkadot SDK generic over `NetworkBackend` * implement `NetworkBackend` for litep2p The new library should be considered experimental which is why `rust-libp2p` will remain as the default option for the time being. This PR currently depends on the master branch of `litep2p` but I'll cut a new release for the library once all review comments have been addresses. --------- Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io> Co-authored-by: Dmitry Markin <dmitry@markin.tech> Co-authored-by: Alexandru Vasile <60601340+lexnv@users.noreply.github.com> Co-authored-by: Alexandru Vasile <alexandru.vasile@parity.io>
29 lines
1.2 KiB
Plaintext
29 lines
1.2 KiB
Plaintext
# Schema: Polkadot SDK PRDoc Schema (prdoc) v1.0.0
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# See doc at https://raw.githubusercontent.com/paritytech/polkadot-sdk/master/prdoc/schema_user.json
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title: "Integrate litep2p into Polkadot SDK"
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doc:
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- audience: Node Dev
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description: |
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litep2p is a libp2p-compatible P2P networking library. It supports all of the features of rust-libp2p
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that are currently being utilized by Polkadot SDK and is a drop-in replacement for any node operator.
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For node developers, introduction of litep2p implies specifying the networking backend that Polkadot SDK
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shall use for P2P networking. A new trait called `NetworkBackend` is introduced which is implemented
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by both the libp2p and litep2p backends and which is used to initialize any networking-related code.
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- audience: Node Operator
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description: |
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litep2p is considered experimental and rust-libp2p will remain as the default networking backend
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for Polkadot SDK but litep2p can be selected with `--network-backend litep2p`.
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crates:
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- name: "sc-network"
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- name: "sc-service"
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- name: "minimal-template-node"
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- name: "solochain-template-node"
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- name: "staging-node-cli"
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- name: "polkadot-service"
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- name: "parachain-template-node"
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