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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 int
   buff := make([]byte, len)
   nTotalRecv = 0
   for {
      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
}