Clat min is zero on a random read, how is that possible when NAND tR
spec is 20-60uS? Also isn't lat = slat + clat, 1 + 0 != 84
fio-2.15
Starting 80 threads
random-100r-0w_4k_qd1_jobs_16: (groupid=0, jobs=16): err= 0:
pid=22233: Tue Feb 21 15:41:33 2017
Description : [Random R/W 100/0 QD1 BLK 4k Jobs 16]
read : io=1045.5GB, bw=609017KB/s, iops=152254, runt=1800001msec
slat (usec): min=1, max=6583, avg= 2.06, stdev= 1.01
clat (usec): min=0, max=8728, avg=102.38, stdev=21.43
lat (usec): min=84, max=8730, avg=104.52, stdev=21.45
clat percentiles (usec):
| 1.00th=[ 85], 5.00th=[ 86], 10.00th=[ 87], 20.00th=[ 89],
| 30.00th=[ 91], 40.00th=[ 98], 50.00th=[ 101], 60.00th=[ 102],
| 70.00th=[ 104], 80.00th=[ 106], 90.00th=[ 116], 95.00th=[ 143],
| 99.00th=[ 175], 99.50th=[ 185], 99.90th=[ 225], 99.95th=[ 239],
| 99.99th=[ 270]
Fio Config:
thread
bs=4k
ioengine=libaio
direct=1
buffered=0
log_avg_msec=1000
group_reporting=1
rw=randread
numjobs=16
iodepth=1
time_based
runtime=1800
refill_buffers
norandommap
filename=/dev/nvme0n1
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