The patch optimizes this case by converting the cached reference from a sequence number to a pointer to the highest packet in the queue that has been SACKed in the past.
这个补丁通过把已缓存的引用从一个序列号转换为指向队列中最高的包（过去已经选择性应答）的指针从而对此情况加以优化。
A reference is an application specific pointer to an object that usually lives in a larger context, such as a server or cluster, and is used by multiple parties.
引用是应用程序的特定指针，该指针指向通常存在于更大的上下文(如服务器或集群)中并且供多方使用的对象。
When passed by reference, a pointer to a pointer to the type is passed on the stack.
当通过引用传递时，该类型的指针的指针在堆栈上传递。
When passed by reference, a pointer to a pointer to the type is passed on the stack.
当通过引用传递时，该类型的指针的指针在堆栈上传递。
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