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。
If the source address and sequence number of a newly received packet matches that of a previously received packet, then the newly received packet is a duplicate and may be dumped.
如果新收到的包序列号和源地址与之前收到的包匹配，那么新收到的包就是重复的，可能会被丢弃掉。
If the source address and sequence number of a newly received packet matches that of a previously received packet, then the newly received packet is a duplicate and may be dumped.
如果新收到的包序列号和源地址与之前收到的包匹配，那么新收到的包就是重复的，可能会被丢弃掉。
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