backwards-read: (g=0): rw=read, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=psync, iodepth=1 fio-3.28 Starting 1 process backwards-read: Laying out IO file (1 file / 128MiB) backwards-read: (groupid=0, jobs=1): err= 0: pid=82684: Tue Feb 7 16:28:36 2023 read: IOPS=936k, BW=3657MiB/s (3835MB/s)(128MiB/35msec) clat (nsec): min=396, max=131451, avg=843.93, stdev=1131.33 lat (nsec): min=412, max=131522, avg=869.06, stdev=1136.31 clat percentiles (nsec): | 1.00th=[ 422], 5.00th=[ 434], 10.00th=[ 446], 20.00th=[ 478], | 30.00th=[ 532], 40.00th=[ 556], 50.00th=[ 604], 60.00th=[ 732], | 70.00th=[ 900], 80.00th=[ 1048], 90.00th=[ 1480], 95.00th=[ 1704], | 99.00th=[ 3408], 99.50th=[ 4320], 99.90th=[ 6112], 99.95th=[ 6816], | 99.99th=[26496] lat (nsec) : 500=23.01%, 750=38.06%, 1000=16.36% lat (usec) : 2=19.60%, 4=2.34%, 10=0.61%, 20=0.01%, 50=0.01% lat (usec) : 250=0.01% cpu : usr=29.41%, sys=64.71%, ctx=3, majf=0, minf=13 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=32768,0,0,0 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=3657MiB/s (3835MB/s), 3657MiB/s-3657MiB/s (3835MB/s-3835MB/s), io=128MiB (134MB), run=35-35msec