nbd_fio_randread_4k_compressed_direct: (g=0): rw=randread, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=psync, iodepth=1 fio-3.15 Starting 1 process nbd_fio_randread_4k_compressed_direct: (groupid=0, jobs=1): err= 0: pid=1834: Fri Aug 30 10:31:30 2019 read: IOPS=12.2k, BW=47.7MiB/s (50.0MB/s)(622MiB/13035msec) clat (usec): min=27, max=805, avg=80.02, stdev=93.43 lat (usec): min=27, max=805, avg=80.19, stdev=93.44 clat percentiles (usec): | 1.00th=[ 35], 5.00th=[ 41], 10.00th=[ 43], 20.00th=[ 45], | 30.00th=[ 46], 40.00th=[ 48], 50.00th=[ 50], 60.00th=[ 53], | 70.00th=[ 56], 80.00th=[ 60], 90.00th=[ 93], 95.00th=[ 351], | 99.00th=[ 433], 99.50th=[ 474], 99.90th=[ 537], 99.95th=[ 570], | 99.99th=[ 644] bw ( KiB/s): min=43864, max=55664, per=99.99%, avg=48858.46, stdev=2347.57, samples=26 iops : min=10966, max=13916, avg=12214.62, stdev=586.89, samples=26 lat (usec) : 50=49.83%, 100=40.53%, 250=0.53%, 500=8.86%, 750=0.24% lat (usec) : 1000=0.01% cpu : usr=4.21%, sys=9.24%, ctx=276099, majf=0, minf=11 IO depths : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0% submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% complete : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% issued rwts: total=159232,0,0,0 short=0,0,0,0 dropped=0,0,0,0 latency : target=0, window=0, percentile=100.00%, depth=1 Run status group 0 (all jobs): READ: bw=47.7MiB/s (50.0MB/s), 47.7MiB/s-47.7MiB/s (50.0MB/s-50.0MB/s), io=622MiB (652MB), run=13035-13035msec Disk stats (read/write): nbd1: ios=157246/0, merge=0/0, ticks=11644/0, in_queue=0, util=99.28%