use SingleReader on low end devices

common/buf/io.go

@@ -59,18 +59,7 @@ func NewReader(reader io.Reader) Reader {
 		return mr
 	}
 
-	if useReadv {
+	return newReaderPlatform(reader)
-		if sc, ok := reader.(syscall.Conn); ok {
-			rawConn, err := sc.SyscallConn()
-			if err != nil {
-				newError("failed to get sysconn").Base(err).WriteToLog()
-			} else {
-				return NewReadVReader(reader, rawConn)
-			}
-		}
-	}
-
-	return NewBytesToBufferReader(reader)
 }
 
 // NewWriter creates a new Writer.

common/buf/io_highend.go

@@ -0,0 +1,23 @@
+// +build 386 amd64 s390 s390x
+
+package buf
+
+import (
+	"io"
+	"syscall"
+)
+
+func newReaderPlatform(reader io.Reader) Reader {
+	if useReadv {
+		if sc, ok := reader.(syscall.Conn); ok {
+			rawConn, err := sc.SyscallConn()
+			if err != nil {
+				newError("failed to get sysconn").Base(err).WriteToLog()
+			} else {
+				return NewReadVReader(reader, rawConn)
+			}
+		}
+	}
+
+	return NewBytesToBufferReader(reader)
+}

common/buf/io_lowend.go

@@ -0,0 +1,13 @@
+// +build mips mipsle mips64 mips64le arm arm64
+
+package buf
+
+import (
+	"io"
+)
+
+func newReaderPlatform(reader io.Reader) Reader {
+	return &SingleReader{
+		Reader: reader,
+	}
+}