root# LC_ALL=C fio --name=randread --rw=randread --bs=4k --ioengine=libaio --iodepth=64 --direct=1 --numjobs=1 --size=1G
randread: (g=0): rw=randread, bs=4K-4K/4K-4K, ioengine=libaio, iodepth=64
fio 1.59
Starting 1 process
randread: Laying out IO file(s) (1 file(s) / 1024MB)
Jobs: 1 (f=1): [r] [100.0% done] [74485K/0K /s] [18.2K/0  iops] [eta 00m:00s]
randread: (groupid=0, jobs=1): err= 0: pid=2647
  read : io=1024.0MB, bw=3924.3KB/s, iops=981 , runt=267206msec
    slat (usec): min=10 , max=337 , avg=14.82, stdev= 3.26
    clat (usec): min=3 , max=5184.1K, avg=65218.98, stdev=192201.89
     lat (usec): min=14 , max=5184.2K, avg=65234.04, stdev=192202.68
    bw (KB/s) : min= 1386, max=79231, per=98.28%, avg=3856.44, stdev=5637.10
  cpu          : usr=0.41%, sys=99.46%, ctx=1402, majf=0, minf=69
  IO depths    : 1=0.1%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=0.1%, >=64=100.0%
     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=0.1%, >=64=0.0%
     issued r/w/d: total=262144/0/0, short=0/0/0
     lat (usec): 4=0.01%, 10=42.19%, 20=13.81%, 50=19.01%, 100=7.11%
     lat (usec): 250=4.38%, 500=1.10%, 750=0.07%, 1000=0.03%
     lat (msec): 2=0.02%, 4=0.01%, 10=0.01%, 20=0.01%, 50=0.06%
     lat (msec): 100=0.24%, 250=0.79%, 500=2.67%, 750=7.84%, 1000=0.39%
     lat (msec): 2000=0.21%, >=2000=0.04%

Run status group 0 (all jobs):
   READ: io=1024.0MB, aggrb=3924KB/s, minb=4018KB/s, maxb=4018KB/s, mint=267206msec, maxt=267206msec

Disk stats (read/write):
  loop0: ios=261741/211, merge=0/5, ticks=17229012/262104, in_queue=17494268, util=100.00%

root# cat /proc/version 
Linux version 3.19.0-rc2-next20141231-1-loopmq-small (sedat.dilek@gmail.com@fambox) (gcc version 4.9.2 (Ubuntu 4.9.2-0ubuntu1~12.04) ) #1 SMP Thu Jan 1 00:07:54 CET 2015


-dileks // 01-JAN-2015