最近在用go写个工具，在几百个协程并行拿多个服务器数据时，用SetReadDeadline设置超时60s时，经常read返回失败，错误信息是timeout，而不设置SetReadDeadline时，反而正常，而且正常数据返回也不可能会超时60s，这是为什么呢？

recv部分的代码

/*** 接收数据包*/
func RecvData(conn net.Conn, len int) ([]byte, bool) {var nTotalRecv intbuff := make([]byte, len)nTotalRecv = 0for {if nTotalRecv >= len {break}//阻塞//conn.SetReadDeadline(time.Now().Add(60 * time.Second))nRecv, err := conn.Read(buff[nTotalRecv:])if err != nil {//if nerr, ok := err.(net.Error); ok && nerr.Timeout() {// log.Error("connect read conn timeout,continue to read.", err, " nRecv:", nRecv, ",totalrecv:", nTotalRecv, ",need read len:", len)// continue//} else {log.Error("connect read conn failed.", err, " nRecv:", nRecv, ",totalrecv:", nTotalRecv, ",need read len:", len)return buff, false//}}nTotalRecv += nRecv}return buff, true
}