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What is cacheable false?
The value of the Cacheable annotation is inherited by subclasses; it can be overridden by specifying Cacheable on a subclass. Cacheable(false) means that the entity and its state must not be cached by the provider.
Which HTTP method is not cacheable?
Other methods, like PUT or DELETE are not cacheable and their result cannot be cached. The status code of the response is known by the application caching, and it is considered cacheable.
What is cacheable and non cacheable memory?
The main memory in your system that can move its information into your system’s cache memory is called the “cacheable memory.” Memory in your system that is not cacheable performs as if your system is cacheless, moving information as needed directly to the processor without the ability to use the cache memory as a fast …
What is the sequence of invalidate and cache flush?
So sequence might be: after first invalidate prefetch put data in cache again -> DMA override data in memory -> cache has data different than memory and cache is marked as having valid data. Second invalidate would ensure that data would be retrieved into cache again, therefore cache and memory finished to be in sync 🙂
What does invalidate do in cache synchronization?
I have some questions on cache synchronization operations. Invalidate: Before cpu tries to read a portion of memory updated by a device, the corresponding memory needs to be invalidated.
When to flush cache and invalidate driver buffer?
Driver buffer is non cacheable so no need for invalidation. DDR buffer should be invalidated before or after (look NOTE below for details) DMA transfering to prevent CPU to use ‘old’ data from cache. Flushing of HW buffer is redundant. ‘Source’ buffer should be flushed, ‘Destination’ buffer should be invalidated.
What does it mean to flush cache to memory?
Flush: Before the device read a portion of memory updated by CPU, CPU must flush (write back is also correct?) the contents from cache to memory, so that device reads the contents from memory with updated contents. If flush is not carried out it may read junk data present in memory as the memory is not still updated with contents written to cache.