只是写到Cache里,Memory的内容要等到cache保存的要被别的数据替换或者系统做cache flush时,才会被更新。 2.Cache的两个函数 --Flush 把Cache内容写回Memory,当Cache为Write through,不需要Flush --Invalidate 把Cache内容直接丢掉不要。 3.Cache的使用场合 当有DMA在使用memory的时候,一般要用到cache的处理。因为DMA...
Write-through vs. write-back Both write-through and write-back caching policies define the way that data is moved from the cache to major storage such as memory or disk. Write-through cache immediately copies new cache data to corresponding storage in main memory or disk. This ensures data ...
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对于write-validate策略,包含写入地址的cache行不会从较低一级内存中取出,数据直接被写入cache,并且该cache行附带一些有效位,除了正在被写入的数据外,该cache行的其它部分数据的有效位都是关闭。 fetch-on-write和write-validate都可以与write-through和write-back策略组合。 write-valid策略要求每个cache行内有额外的一...
In a write-back operation, any new, requested processor data is written to the cache, but not in the memory. The memory write process is only performed when the cache data needs to be edited or purged for new content. Write-back cache works in contrast to write-through cache, which simu...
Write-through cache halts application processing until data in the cache is also updated in main memory or disk. This ensures cache and storage data are always consistent before an application is allowed to continue. What are the benefits and challenges of write-back cache?
What Does Write-Through Cache Mean? Write-through cache is a caching technique in which data is simultaneously copied to higher level caches, backing storage or memory. It is common in processor architectures that perform a write operation on cache and backing stores at the same time. ...
Learn about write-through caching and how to write data to the cache and database simultaneously ensuring data integrity.
IOCTL_STORAGE_QUERY_PROPERTY请求报告STORAGE_WRITE_CACHE_PROPERTY结构中的WRITE_CACHE_ENABLE值。 要求 要求价值 标头ntddstor.h 另请参阅 IOCTL_STORAGE_QUERY_PROPERTY STORAGE_WRITE_CACHE_PROPERTY 反馈 此页面是否有帮助? 是否 提供产品反馈| 在Microsoft Q&A 获取帮助...
WRITE_CACHE_TYPE枚举中的一个值,该值指示当前写入缓存类型。 值含义 WriteCacheTypeUnknown 0 系统无法报告写入缓存的类型。 WriteCacheTypeNone 1 设备没有写入缓存。 WriteCacheTypeWriteBack 2 设备具有写回缓存。 WriteCacheTypeWriteThrough 3 设备具有写通缓存。