feat(tcp): make TCP_NODELAY the default

Superseeds libp2p#4916.
Fixes: libp2p#4890.

Pull-Request: libp2p#5469.

Cargo.toml

@@ -105,7 +105,7 @@ libp2p-stream = { version = "0.1.0-alpha.1", path = "protocols/stream" }
 libp2p-swarm = { version = "0.45.0", path = "swarm" }
 libp2p-swarm-derive = { version = "=0.34.2", path = "swarm-derive" } # `libp2p-swarm-derive` may not be compatible with different `libp2p-swarm` non-breaking releases. E.g. `libp2p-swarm` might introduce a new enum variant `FromSwarm` (which is `#[non-exhaustive]`) in a non-breaking release. Older versions of `libp2p-swarm-derive` would not forward this enum variant within the `NetworkBehaviour` hierarchy. Thus the version pinning is required.
 libp2p-swarm-test = { version = "0.3.0", path = "swarm-test" }
-libp2p-tcp = { version = "0.41.1", path = "transports/tcp" }
+libp2p-tcp = { version = "0.42.0", path = "transports/tcp" }
 libp2p-tls = { version = "0.4.0", path = "transports/tls" }
 libp2p-uds = { version = "0.40.0", path = "transports/uds" }
 libp2p-upnp = { version = "0.2.2", path = "protocols/upnp" }

transports/tcp/CHANGELOG.md

@@ -1,5 +1,7 @@
-## 0.41.1
+## 0.42.0
 
+- Disable Nagle's algorithm (i.e. `TCP_NODELAY`) by default.
+  See [PR 4916](https://github.com/libp2p/rust-libp2p/pull/4916)
 
 ## 0.41.0
 

transports/tcp/Cargo.toml

@@ -3,7 +3,7 @@ name = "libp2p-tcp"
 edition = "2021"
 rust-version = { workspace = true }
 description = "TCP/IP transport protocol for libp2p"
-version = "0.41.1"
+version = "0.42.0"
 authors = ["Parity Technologies <admin@parity.io>"]
 license = "MIT"
 repository = "https://github.com/libp2p/rust-libp2p"

transports/tcp/src/lib.rs

@@ -161,7 +161,7 @@ impl Config {
     pub fn new() -> Self {
         Self {
             ttl: None,
-            nodelay: None,
+            nodelay: Some(false), // Disable Nagle's algorithm by default
             backlog: 1024,
             enable_port_reuse: false,
         }