feat: require bbr by default

Makefile

@@ -31,7 +31,7 @@ build: mod
 .PHONY: build
 
 ## install: Build and install the celestia-appd binary into the $GOPATH/bin directory.
-install: go.sum
+install: go.sum check-bbr
 	@echo "--> Installing celestia-appd"
 	@go install $(BUILD_FLAGS) ./cmd/celestia-appd
 .PHONY: install
@@ -212,3 +212,28 @@ prebuilt-binary:
 		ghcr.io/goreleaser/goreleaser-cross:${GOLANG_CROSS_VERSION} \
 		release --clean
 .PHONY: prebuilt-binary
+
+## check-bbr: Check if your system uses BBR congestion control algorithm. Only works on Linux.
+check-bbr:
+	@echo "Checking if BBR is enabled..."
+	@if [ "$(sysctl net.ipv4.tcp_congestion_control | awk '{print $3}')" != "bbr" ]; then \
+	    echo "WARNING: BBR is not enabled. Please enable BBR for optimal performance. Call make enable-bbr or see Usage section in the README."; \
+	else \
+	    echo "BBR is enabled."; \
+	fi
+.PHONY: check-bbr
+
+## enable-bbr: Enable BBR congestion control algorithm. Only works on Linux.
+enable-bbr:
+	@echo "Configuring system to use BBR..."
+	@if [ "$(sysctl net.ipv4.tcp_congestion_control | awk '{print $3}')" != "bbr" ]; then \
+	    echo "BBR is not enabled. Configuring BBR..."; \
+	    sudo modprobe tcp_bbr; \
+	    echo "net.core.default_qdisc=fq" | sudo tee -a /etc/sysctl.conf; \
+	    echo "net.ipv4.tcp_congestion_control=bbr" | sudo tee -a /etc/sysctl.conf; \
+	    sudo sysctl -p; \
+	    echo "BBR has been enabled."; \
+	else \
+	    echo "BBR is already enabled."; \
+	fi
+.PHONY: enable-bbr

README.md

@@ -77,6 +77,22 @@ See <https://docs.celestia.org/nodes/celestia-app> for more information.
 
 ## Usage
 
+First, make sure that the [BBR](https://www.ietf.org/archive/id/draft-cardwell-iccrg-bbr-congestion-control-01.html) ("Bottleneck Bandwidth and Round-trip propagation time") congestion control algorithm is enabled in the
+system's kernel. The result should contain `bbr`:
+
+```sh
+sysctl net.ipv4.tcp_congestion_control
+```
+
+If not, enable it on Linux by calling the `make use-bbr` or by running:
+
+```sh
+sudo modprobe tcp_bbr
+net.core.default_qdisc=fq
+net.ipv4.tcp_congestion_control=bbr
+sudo sysctl -p
+```
+
 ```sh
 # Print help
 celestia-appd --help

cmd/celestia-appd/cmd/root.go

@@ -126,7 +126,7 @@ func initRootCommand(rootCommand *cobra.Command, encodingConfig encoding.Config)
 	)
 
 	// Add the following commands to the rootCommand: start, tendermint, export, version, and rollback.
-	server.AddCommands(rootCommand, app.DefaultNodeHome, NewAppServer, appExporter, addModuleInitFlags)
+	addCommands(rootCommand, app.DefaultNodeHome, NewAppServer, appExporter, addModuleInitFlags)
 }
 
 // setDefaultConsensusParams sets the default consensus parameters for the