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buffer, osd: add missing crc cache miss perf counter #14957
I actually did and found results interesting. According to this, the effectiveness of crc cache is around 23% for filestore and 44% on bluestore (tested on vstart cluster with rados bench write/read 4m for 60s), i.e. 23%/44% of crc requests were cache hits (either direct or adjusted). I pushed out this pr so others can check that on their clusters.