Hi
There is false pass when changing rand_seed in verify_only.
What have I missed in workloads? or it's a bug in fio 3.18?
I've run the following workloads:
1) write random, with a rand_seed.
[global]
ioengine=libaio
iodepth=32
runtime=0
cpus_allowed_policy=split
group_reporting=1
cpus_allowed=0-0
do_verify=1
verify=sha512
bs=4096
filename=/dev/nvme0n2
direct=1
loops=1
percentile_list=99:99.9:99.99:99.999:99.9999
norandommap
random_generator=lfsr
rw=randwrite
verify_fatal=1
allrandrepeat=0
randseed=44234
[job_0]
offset=0
size=52428800
test pass.
2) write random, with other rand_seed and verify_only=1.
job is expected to fail but it passed successfully.
[global]
ioengine=libaio
iodepth=32
runtime=0
cpus_allowed_policy=split
group_reporting=1
cpus_allowed=0-0
do_verify=1
verify=sha512
bs=4096
filename=/dev/nvme0n2
direct=1
loops=1
percentile_list=99:99.9:99.99:99.999:99.9999
norandommap
random_generator=lfsr
rw=randwrite
verify_fatal=1
allrandrepeat=0
randseed=99
verify_only=1
[job_0]
offset=0
size=52428800
output of second job:
job_0: (g=0): rw=randwrite, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T)
4096B-4096B, ioengine=libaio, iodepth=32
fio-3.18
Starting 1 process
job_0: (groupid=0, jobs=1): err= 0: pid=4165: Mon Feb 24 11:16:50 2020
read: IOPS=6333, BW=24.7MiB/s (25.9MB/s)(50.0MiB/2021msec)
slat (usec): min=4, max=111, avg=16.84, stdev= 4.66
clat (usec): min=191, max=5939, avg=4885.49, stdev=194.57
lat (usec): min=206, max=5954, avg=4902.81, stdev=194.61
clat percentiles (usec):
| 99.0000th=[ 5211], 99.9000th=[ 5604], 99.9900th=[ 5932],
| 99.9990th=[ 5932], 99.9999th=[ 5932]
lat (usec) : 250=0.01%, 500=0.01%, 750=0.01%, 1000=0.01%
lat (msec) : 2=0.05%, 4=0.10%, 10=49.81%, >=2000=50.00%
cpu : usr=80.79%, sys=10.26%, ctx=22986, majf=0, minf=315
IO depths : 1=50.0%, 2=0.1%, 4=0.1%, 8=0.1%, 16=0.1%, 32=49.9%, >=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=0.1%, 64=0.0%, >=64=0.0%
issued rwts: total=12800,12800,0,0 short=0,0,0,0 dropped=0,0,0,0
Run status group 0 (all jobs):
READ: bw=24.7MiB/s (25.9MB/s), 24.7MiB/s-24.7MiB/s
(25.9MB/s-25.9MB/s), io=50.0MiB (52.4MB), run=2021-2021msec
Disk stats (read/write):
nvme0n2: ios=0/0, merge=0/0, ticks=0/0, in_queue=0, util=0.00%`
--
Shoshan Dagany
