On 2019/10/27 5:15 下午, Teodor Milkov wrote: > Just for the record -- here are the times to register a cache device vs. > how full it is (used % from priority_stats): > > || GB || Time || GB/s || > | 111 | 0m10.8s | 10.3 | > | 209 | 0m20.3s | 10.3 | > | 433 | 0m43.1s | 10.0 | > | 931 | 1m41.6s | 9.2 | > | 1695 | 3m11s | 8.9 | > > This is on Intel DC P3500 series 2TB NVMe drive + > Xeon Silver 4114 CPU @ 2.20GHz. > Thanks for the information. If you may check the size of the B+tree (/sys/fs/bcache/<cache-set-uuid>/internal/btree_nodes), maybe it can be more clear to find a connection between B+btree size and register time. If anybody helps to compose a patch doing multiple-kthread btree nodes checksum check, it will be cool. It is on my to-do list, but no my current task. -- Coly Li
