Bug 1449638

Hi,

The fio issue has been fixed in https://github.com/axboe/fio/issues/376
I still need to verify it at my end.

Atin,
I think the content of the doc text will be different now.

on-qa validation:
based on  all above comments this is a problem with fio writing in 1Byte chunks
As this should be fixed in latest FIO, I am comparing the writes b/w fio.2.2.8(where the issue was seen) as with latest fio
also tested with 10MB file
below is the result

[root@dhcp35-72 dispersevol1]# rpm -qa|grep fio
fio-2.2.8-2.el7.x86_64
[root@dhcp35-72 dispersevol1]# time fio --randrepeat=1 --ioengine=libaio --direct=0 --gtod_reduce=1 --name=test --filename=fiotest.fio --iodepth=16 --size=10M --readwrite=write
test: (g=0): rw=write, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=16
fio-2.2.8
Starting 1 process
test: Laying out IO file(s) (1 file(s) / 10MB)
Jobs: 1 (f=1): [W(1)] [100.0% done] [0KB/1144KB/0KB /s] [0/286/0 iops] [eta 00m:00s]
test: (groupid=0, jobs=1): err= 0: pid=11112: Tue May 29 21:35:52 2018
  write: io=10240KB, bw=1160.4KB/s, iops=290, runt=  8825msec
  cpu          : usr=0.27%, sys=1.10%, ctx=2566, majf=0, minf=23
  IO depths    : 1=0.1%, 2=0.1%, 4=0.2%, 8=0.3%, 16=99.4%, 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=0.1%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued    : total=r=0/w=2560/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=16

Run status group 0 (all jobs):
  WRITE: io=10240KB, aggrb=1160KB/s, minb=1160KB/s, maxb=1160KB/s, mint=8825msec, maxt=8825msec

real	0m19.064s
user	0m0.136s
sys	0m0.718s



########## with latest fio
[root@dhcp35-72 fio]# time fio --randrepeat=1 --ioengine=libaio --direct=0 --gtod_reduce=1 --name=test --filename=fiotest.fio --iodepth=16 --size=10M --readwrite=write
test: (g=0): rw=write, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=libaio, iodepth=16
fio-3.1
Starting 1 process
test: Laying out IO file (1 file / 10MiB)
fio: native_fallocate call failed: Operation not supported
Jobs: 1 (f=1): [W(1)][100.0%][r=0KiB/s,w=976KiB/s][r=0,w=244 IOPS][eta 00m:00s]
test: (groupid=0, jobs=1): err= 0: pid=11132: Tue May 29 21:41:55 2018
  write: IOPS=270, BW=1080KiB/s (1106kB/s)(10.0MiB/9479msec)
   bw (  KiB/s): min=  888, max= 1208, per=99.39%, avg=1073.44, stdev=92.80, samples=18
   iops        : min=  222, max=  302, avg=268.33, stdev=23.19, samples=18
  cpu          : usr=0.19%, sys=1.52%, ctx=2566, majf=0, minf=20
  IO depths    : 1=0.1%, 2=0.1%, 4=0.2%, 8=0.3%, 16=99.4%, 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=0.1%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued rwt: total=0,2560,0, short=0,0,0, dropped=0,0,0
     latency   : target=0, window=0, percentile=100.00%, depth=16

Run status group 0 (all jobs):
  WRITE: bw=1080KiB/s (1106kB/s), 1080KiB/s-1080KiB/s (1106kB/s-1106kB/s), io=10.0MiB (10.5MB), run=9479-9479msec

real	0m10.252s
user	0m0.118s
sys	0m0.665s
[root@dhcp35-72 fio]# date
Tue May 29 21:41:57 IST 2018
[root@dhcp35-72 fio]# rpm -qa|grep fio
fio-3.1-2.el7.x86_64
[root@dhcp35-72 fio]# du -sh fiotest.fio 
10M	fiotest.fio
[root@dhcp35-72 fio]# 


as the performance has improved a lot , moving to verified


test on gnfs as reported by customer

Srijita brought this bug to my notice where this bug is actually marked as Verified

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2018:2607