xfs on sd

root@macchiatobin:/tmp/sd# fio --name=random-write --ioengine=io_uring --rw=randwrite --bs=4k --numjobs=1 --size=4g --iodepth=1 --runtime=60 --time_based --end_fsync=1
random-write: (g=0): rw=randwrite, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=io_uring, iodepth=1
fio-3.21
Starting 1 process
random-write: Laying out IO file (1 file / 4096MiB)
Jobs: 1 (f=1): [F(1)][100.0%][eta 00m:00s]
random-write: (groupid=0, jobs=1): err= 0: pid=8991: Mon Dec  7 00:18:17 2020
  write: IOPS=1614, BW=6458KiB/s (6613kB/s)(2947MiB/467323msec); 0 zone resets
    slat (nsec): min=2000, max=65720, avg=3776.10, stdev=551.82
    clat (nsec): min=280, max=39482k, avg=73888.68, stdev=1169240.35
     lat (usec): min=9, max=39485, avg=77.87, stdev=1169.24
    clat percentiles (usec):
     |  1.00th=[   10],  5.00th=[   11], 10.00th=[   11], 20.00th=[   11],
     | 30.00th=[   11], 40.00th=[   13], 50.00th=[   13], 60.00th=[   13],
     | 70.00th=[   13], 80.00th=[   13], 90.00th=[   14], 95.00th=[   15],
     | 99.00th=[   20], 99.50th=[   23], 99.90th=[19530], 99.95th=[28705],
     | 99.99th=[28967]
   bw (  KiB/s): min= 4352, max=248832, per=100.00%, avg=50694.79, stdev=80705.41, samples=119
   iops        : min= 1088, max=62210, avg=12673.70, stdev=20176.36, samples=119
  lat (nsec)   : 500=0.01%, 750=0.01%, 1000=0.01%
  lat (usec)   : 2=0.01%, 10=1.55%, 20=97.63%, 50=0.50%, 100=0.02%
  lat (usec)   : 250=0.01%, 500=0.01%
  lat (msec)   : 20=0.22%, 50=0.07%
  cpu          : usr=0.66%, sys=0.95%, ctx=754595, majf=0, minf=30
  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=0,754502,0,0 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):
  WRITE: bw=6458KiB/s (6613kB/s), 6458KiB/s-6458KiB/s (6613kB/s-6613kB/s), io=2947MiB (3090MB), run=467323-467323msec

Disk stats (read/write):
  mmcblk1: ios=0/171503, merge=0/7429, ticks=0/27415929, in_queue=27415930, util=99.26%