M.2 256GB Samsung 950 EVO

sudo fio --filename=./testfile  --direct=1 --sync=1 --rw=read --bs=4k --numjobs=8 --iodepth=32 --runtime=60 --time_based --group_reporting --size=1G --name=journal-test


journal-test: (groupid=0, jobs=8): err= 0: pid=3092: Thu Jun  2 22:48:23 2016
  read : io=21433MB, bw=365792KB/s, iops=91447, runt= 60001msec
    clat (usec): min=11, max=15999, avg=86.72, stdev=34.31
     lat (usec): min=11, max=15999, avg=86.81, stdev=34.31
    clat percentiles (usec):
     |  1.00th=[   60],  5.00th=[   63], 10.00th=[   66], 20.00th=[   75],
     | 30.00th=[   78], 40.00th=[   80], 50.00th=[   82], 60.00th=[   90],
     | 70.00th=[   94], 80.00th=[  102], 90.00th=[  108], 95.00th=[  111],
     | 99.00th=[  124], 99.50th=[  129], 99.90th=[  195], 99.95th=[  322],
     | 99.99th=[ 1080]
    bw (KB  /s): min=42258, max=51088, per=12.50%, avg=45724.97, stdev=963.51
    lat (usec) : 20=0.07%, 50=0.07%, 100=78.98%, 250=20.81%, 500=0.05%
    lat (usec) : 750=0.01%, 1000=0.01%
    lat (msec) : 2=0.01%, 4=0.01%, 10=0.01%, 20=0.01%
  cpu          : usr=1.94%, sys=7.51%, ctx=5488693, majf=0, minf=88
  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    : total=r=5486969/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
     latency   : target=0, window=0, percentile=100.00%, depth=32

Run status group 0 (all jobs):
   READ: io=21433MB, aggrb=365791KB/s, minb=365791KB/s, maxb=365791KB/s, mint=60001msec, maxt=60001msec

Disk stats (read/write):
  nvme0n1: ios=5481517/1110, merge=0/0, ticks=434580/3484, in_queue=438904, util=100.00%

sudo fio --filename=./testfile  --direct=1 --sync=1 --rw=write --bs=4k --numjobs=8 --iodepth=32 --runtime=60 --time_based --group_reporting --size=1G --name=journal-test

journal-test: (groupid=0, jobs=8): err= 0: pid=3193: Thu Jun  2 22:50:52 2016
  write: io=201316KB, bw=3355.5KB/s, iops=838, runt= 60004msec
    clat (msec): min=1, max=25, avg= 9.53, stdev= 2.41
     lat (msec): min=1, max=25, avg= 9.53, stdev= 2.41
    clat percentiles (usec):
     |  1.00th=[ 4960],  5.00th=[ 6112], 10.00th=[ 6432], 20.00th=[ 7840],
     | 30.00th=[ 8640], 40.00th=[ 8768], 50.00th=[ 8896], 60.00th=[ 9280],
     | 70.00th=[10304], 80.00th=[10688], 90.00th=[13120], 95.00th=[14272],
     | 99.00th=[17280], 99.50th=[17792], 99.90th=[21120], 99.95th=[21632],
     | 99.99th=[22912]
    bw (KB  /s): min=  369, max=  488, per=12.50%, avg=419.34, stdev=15.84
    lat (msec) : 2=0.01%, 4=0.05%, 10=64.40%, 20=35.37%, 50=0.17%
  cpu          : usr=0.13%, sys=1.05%, ctx=211122, majf=0, minf=87
  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    : total=r=0/w=50329/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
     latency   : target=0, window=0, percentile=100.00%, depth=32

Run status group 0 (all jobs):
  WRITE: io=201316KB, aggrb=3355KB/s, minb=3355KB/s, maxb=3355KB/s, mint=60004msec, maxt=60004msec

Disk stats (read/write):
  nvme0n1: ios=12576/95360, merge=0/0, ticks=7060/120380, in_queue=127380, util=98.88%