Assume that the maximum timer interval value any timer takes on does not exceed an upper limit (tmax).
假定所有计时器的最大计时时间间隔都不超过某个上限(tmax)。
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Since the maximum value (tmax) for the AIX TCP RTO is 64 seconds, this is large enough to ensure that all retransmission timers in a slot expire at the same time and not in the subsequent cycles.