My question is, how does the CPU write data to ram?
From what I understand, modern CPU's use different levels of cache to speed up ram access. The RAM gets a command for information and then sends a burst of data to the CPU which stores the required data (and a bunch of extra data that was close to the address the CPU wanted) into the highest level cache, the CPU then progressively asks the different caches to send smaller and smaller chunks of data down the levels of caches until it is in the level 1 cache which then gets read directly into a CPU register.
How does this process work when the CPU writes to memory? Does the computer go backwards down the levels of cache (in reverse order as compared to read)? If so, what about synchronizing the information in the different caches with the main memory? Also, how is the speed of a write operation compared to a read one? What happens if I'm continuously writing to RAM, such as in the case of a bucket sort?
Thanks in advance,
Edit: I still haven't really gotten an answer which I can fully accept. I want to know especially about the synchronization part of the RAM write. I know that we write to the L1 cache directly from CPU and that data gets pushed down the cache levels as we synchronize the different levels of caches and eventually the main RAM gets synchronized with the highest tier cache. However, what i would like to know is WHEN do caches synchronize and scynocronize with main RAM and how fast are their speeds in relation to read commands.