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1. 发明公开

EP2539824A1 CRITICAL WORD FORWARDING WITH ADAPTIVE PREDICTION 审中-公开
标题翻译：美国麻省理工学院适应症VERZÖGERUNGSVORHERSAGE
公开(公告)号：EP2539824A1
公开(公告)日：2013-01-02
申请号：EP11743162.7
申请日：2011-05-26
申请人： Apple Inc.
发明人： LILLY, Brian P. , KASSOFF, Jason M. , CHEN, Hao
IPC分类号： G06F13/16
CPC分类号： G06F13/1668 , G06F12/0862
摘要： In an embodiment, a system includes a memory controller, processors and corresponding caches. The system may include sources of uncertainty that prevent the precise scheduling of data forwarding for a load operation that misses in the processor caches. The memory controller may provide an early response that indicates that data should be provided in a subsequent clock cycle. An interface unit between the memory controller and the caches/processors may predict a delay from a currently-received early response to the corresponding data, and may speculatively prepare to forward the data assuming that it will be available as predicted. The interface unit may monitor the delays between the early response and the forwarding of the data, or at least the portion of the delay that may vary. Based on the measured delays, the interface unit may modify the subsequently predicted delays.
摘要翻译：在一个实施例中，系统包括存储器控制器，处理器和对应的高速缓存。该系统可以包括不确定性源，其阻止针对处理器高速缓存中丢失的加载操作的数据转发的精确调度。存储器控制器可以提供指示在随后的时钟周期中应该提供数据的早期响应。存储器控制器和高速缓存/处理器之间的接口单元可以预测从当前接收的早期响应到相应数据的延迟，并且可以推测地准备转发数据，假设它将如预期的那样可用。接口单元可以监视早期响应和数据转发之间的延迟，或至少可能变化的延迟部分。基于测量的延迟，接口单元可以修改随后预测的延迟。

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