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    • 6. 发明授权
    • Compression status bit cache with deterministic isochronous latency
    • 具有确定性同步延迟的压缩状态位缓存
    • US08595437B1
    • 2013-11-26
    • US12276147
    • 2008-11-21
    • David B. GlascoPeter B. HolmqvistGeorge R. LynchPatrick R. MarchandKaran MehraJames Roberts
    • David B. GlascoPeter B. HolmqvistGeorge R. LynchPatrick R. MarchandKaran MehraJames Roberts
    • G06F12/08
    • G06F12/0811G06F12/0804G06F12/084G06F2212/302G06F2212/401
    • One embodiment of the present invention sets forth a compression status bit cache with deterministic latency for isochronous memory clients of compressed memory. The compression status bit cache improves overall memory system performance by providing on-chip availability of compression status bits that are used to size and interpret a memory access request to compressed memory. To avoid non-deterministic latency when an isochronous memory client accesses the compression status bit cache, two design features are employed. The first design feature involves bypassing any intermediate cache when the compression status bit cache reads a new cache line in response to a cache read miss, thereby eliminating additional, potentially non-deterministic latencies outside the scope of the compression status bit cache. The second design feature involves maintaining a minimum pool of clean cache lines by opportunistically writing back dirty cache lines and, optionally, temporarily blocking non-critical requests that would dirty already clean cache lines. With clean cache lines available to be overwritten quickly, the compression status bit cache avoids incurring additional miss write back latencies.
    • 本发明的一个实施例针对压缩存储器的同步存储器客户端提出了具有确定性延迟的压缩状态位缓存。 压缩状态位缓存通过提供压缩状态位的片上可用性来提高整体存储器系统性能,压缩状态位用于对存储器访问请求进行大小和解释,并将其解释为压缩存储器。 为了避免同步存储器客户端访问压缩状态位缓存时的非确定性延迟,采用了两个设计特征。 第一个设计功能涉及当压缩状态位缓存读取新的高速缓存行以响应高速缓存读取未命中时绕过任何中间缓存,从而消除在压缩状态位缓存范围之外的额外的潜在的非确定性延迟。 第二个设计功能包括通过机会地写回脏的高速缓存线,以及可选地临时阻止将已经清除高速缓存行的非关键请求,来保持最小的干净的高速缓存行池。 使用干净的缓存线可以快速覆盖,压缩状态位缓存避免了额外的错误回写延迟。