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dm-crypt perf drops - Coggle Diagram
dm-crypt perf drops
observation
avg throughput(1MB bs): 189M/s -> 166MB/s
workload
O_RDWR|O_CREAT|O_DSYNC|O_DIRECT
1MB write each time
sequential write
QD: 1
block
rq_size
sched
8: deadline
7: cfq?
deadline
tasks
possible reasons
blk-mq
extra run queue
observe virtscsi_queuecommand
requeue work