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Bookmark or Share- c - What are perf cache events meaning? - Stack Overflowperf stat -e L1-icache-load-misses ls caches caches~ out Performance counter stats for 'ls': 26,760 L1-icache-load-misses 0.002816690 seconds time elapsed perf stat -e cache-misses ls caches caches~ out Performance counter stats for 'ls': 5,708 cache-misses 0.002822122 seconds time elapsed
- ESP8266/Arduino: Why is it necessary to add the ICACHE_RAM_ATTR macro ...With ICACHE_RAM_ATTR you put the function on the RAM. With ICACHE_FLASH_ATTR you put the function on the FLASH (to save RAM). Interrupt functions should use the ICACHE_RAM_ATTR. Function that are called often, should not use any cache attribute. Important: NEVER access your flash inside an interrupt!
- What is meant by data cache and instruction cache?@Celeritas What I am saying is that with an Icache, instead of always having fetch [wait for memory]/decode/execute the processor more often has fetch [cache hit]/decode/execute whether because the code was recently executed (loop or recent function call) or because the successive instructions were "prefetched" because the cache is filled in chunks (x86 implementations often use 64B cache blocks).
- c - How is x86 instruction cache synchronized? - Stack OverflowLet's come to the function call "a()". Again the processor do the Instruction Fetch from L2 Cache into L1 iCache and so on. Result of this user mode program will be the same on any Linux under any processor, due to correct implementation of low level mmap() syscall and Cache coherency protocol!
- c - How can I cause an instruction cache miss? - Stack Overflow"Instruction fetch" is part of the CPU's execution pipeline, and refers to bringing an opcode from icache into the CPU's execution unit, where it can start decoding and doing work. That is different from "instruction cache" fetching, which must happen many cycles earlier and involves the cache circuitry making a request to the main memory unit ...
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