Optimize remote daemon builds and TCP latency

Sources/Workspace.swift

@@ -1997,7 +1997,9 @@ private final class WorkspaceRemoteDaemonProxyTunnel {
                 NSLocalizedDescriptionKey: "invalid local proxy port \(port)",
             ])
         }
-        let parameters = NWParameters.tcp
+        let tcpOptions = NWProtocolTCP.Options()
+        tcpOptions.noDelay = true
+        let parameters = NWParameters(tls: nil, tcp: tcpOptions)
         parameters.allowLocalEndpointReuse = true
         parameters.requiredLocalEndpoint = .hostPort(host: NWEndpoint.Host("127.0.0.1"), port: localPort)
         return try NWListener(using: parameters)
@@ -2719,7 +2721,9 @@ private final class WorkspaceRemoteCLIRelayServer {
     }
 
     private static func makeLoopbackListener() throws -> NWListener {
-        let parameters = NWParameters.tcp
+        let tcpOptions = NWProtocolTCP.Options()
+        tcpOptions.noDelay = true
+        let parameters = NWParameters(tls: nil, tcp: tcpOptions)
         parameters.allowLocalEndpointReuse = true
         parameters.requiredLocalEndpoint = .hostPort(host: NWEndpoint.Host("127.0.0.1"), port: .any)
         return try NWListener(using: parameters)
@@ -3806,7 +3810,7 @@ private final class WorkspaceRemoteSessionController {
         let ldflags = "-s -w -X main.version=\(version)"
         let result = try runProcess(
             executable: goBinary,
-            arguments: ["build", "-trimpath", "-ldflags", ldflags, "-o", output.path, "./cmd/cmuxd-remote"],
+            arguments: ["build", "-trimpath", "-buildvcs=false", "-ldflags", ldflags, "-o", output.path, "./cmd/cmuxd-remote"],
             environment: env,
             currentDirectory: daemonRoot,
             stdin: nil,

daemon/remote/cmd/cmuxd-remote/cli.go

@@ -507,6 +507,7 @@ func dialTCPRetry(addr string, timeout time.Duration, refreshAddr func() string)
 	for {
 		conn, err := net.DialTimeout("tcp", addr, 2*time.Second)
 		if err == nil {
+			setTCPNoDelay(conn)
 			return conn, addr, nil
 		}
 		if time.Now().After(deadline) {

daemon/remote/cmd/cmuxd-remote/main.go

@@ -173,6 +173,14 @@ func runStdioServer(stdin io.Reader, stdout io.Writer) error {
 	}
 }
 
+func setTCPNoDelay(conn net.Conn) {
+	tcpConn, ok := conn.(*net.TCPConn)
+	if !ok {
+		return
+	}
+	_ = tcpConn.SetNoDelay(true)
+}
+
 func readRPCFrame(reader *bufio.Reader, maxBytes int) ([]byte, bool, error) {
 	frame := make([]byte, 0, 1024)
 	for {
@@ -345,6 +353,7 @@ func (s *rpcServer) handleProxyOpen(req rpcRequest) rpcResponse {
 			},
 		}
 	}
+	setTCPNoDelay(conn)
 
 	s.mu.Lock()
 	streamID := fmt.Sprintf("s-%d", s.nextStreamID)

scripts/build_remote_daemon_release_assets.sh

@@ -68,6 +68,14 @@ DAEMON_ROOT="${REPO_ROOT}/daemon/remote"
 mkdir -p "$OUTPUT_DIR"
 rm -f "$OUTPUT_DIR"/cmuxd-remote-* "$OUTPUT_DIR"/cmuxd-remote-checksums.txt "$OUTPUT_DIR"/cmuxd-remote-manifest.json
 
+DAEMON_GO_LDFLAGS="-s -w -X main.version=${VERSION}"
+DAEMON_GO_BUILD_ARGS=(
+  build
+  -trimpath
+  -buildvcs=false
+  -ldflags "$DAEMON_GO_LDFLAGS"
+)
+
 CHECKSUMS_ASSET_NAME="cmuxd-remote-checksums.txt"
 CHECKSUMS_PATH="${OUTPUT_DIR}/${CHECKSUMS_ASSET_NAME}"
 MANIFEST_PATH="${OUTPUT_DIR}/cmuxd-remote-manifest.json"
@@ -94,7 +102,7 @@ for target in "${TARGETS[@]}"; do
     GOOS="$GOOS" \
     GOARCH="$GOARCH" \
     CGO_ENABLED=0 \
-    go build -trimpath -ldflags "-s -w -X main.version=${VERSION}" \
+    go "${DAEMON_GO_BUILD_ARGS[@]}" \
       -o "$OUTPUT_PATH" \
       ./cmd/cmuxd-remote
   )