use fixed buffer size

connector/ss/udp/connector.go

@@ -85,7 +85,7 @@ func (c *ssuConnector) Connect(ctx context.Context, conn net.Conn, network, addr
 		}
 
 		// standard UDP relay
-		return ss.UDPClientConn(pc, conn.RemoteAddr(), taddr, c.md.bufferSize), nil
+		return ss.UDPClientConn(pc, conn.RemoteAddr(), taddr), nil
 	}
 
 	if c.cipher != nil {

connector/ss/udp/metadata.go

@@ -1,7 +1,6 @@
 package ss
 
 import (
-	"math"
 	"time"
 
 	mdata "github.com/go-gost/core/metadata"
@@ -11,24 +10,16 @@ import (
 type metadata struct {
 	key            string
 	connectTimeout time.Duration
-	bufferSize     int
 }
 
 func (c *ssuConnector) parseMetadata(md mdata.Metadata) (err error) {
 	const (
 		key            = "key"
 		connectTimeout = "timeout"
-		bufferSize     = "bufferSize" // udp buffer size
 	)
 
 	c.md.key = mdutil.GetString(md, key)
 	c.md.connectTimeout = mdutil.GetDuration(md, connectTimeout)
 
-	if bs := mdutil.GetInt(md, bufferSize); bs > 0 {
-		c.md.bufferSize = int(math.Min(math.Max(float64(bs), 512), 64*1024))
-	} else {
-		c.md.bufferSize = 4096
-	}
-
 	return
 }