Thank you for your answer.
I'm using ext4. I guess it supports polling because I could get sub 10
microseconds latency with an Intel Optane SSDPED1D280GA 260GB and
pvsync2. If it helps here's how I'm running it:
fio global.fio --size=50G --ioengine=io_uring --hipri --direct=1
--rw=randwrite --iodepth=256 --bs=4K --numjobs=4 --offset_increment=25%
The global.fio has:
ioengine=io_uring
hipri
direct=1
thread=1
buffered=0
size=100%
randrepeat=0
time_based
ramp_time=0
norandommap
refill_buffers
log_max_value=1
log_avg_msec=1000
group_reporting
percentile_list=50:60:70:80:90:95:99
Your help is highly appreciated, thank you.
Hamilton.
On 25/05/20 3:21 p. m., Jens Axboe wrote:
On 5/25/20 11:45 AM, Hamilton Tobon Mosquera wrote:
Hi there,
I'm trying to run sequential and random reads/writes in parallel using
the io_uring engine with the HIPRI flag activated to enable polling. The
file size is 200G, the number of fio threads is 4. The --size flags is
set to 200/4, and the --offset_increment is set to 25%. I could
effectively do it with pvsync2 engine but when I switch to io_uring the
workloads immediately (they do not even work for 1 sec) fail with these
errors:
fio: io_u error on file /path/to/file: Operation not supported: write
offset=3238043648, buflen=4096
fio: io_u error on file /path/to/file: Operation not supported: write
offset=88715874304, buflen=4096
fio: io_u error on file /path/to/file: Operation not supported: write
offset=174739943424, buflen=4096
fio: io_u error on file /path/to/file: Operation not supported: write
offset=112642154496, buflen=4096
The offsets are under 200G, I don't understand why it's returning those
errors. Can someone help please?.
What file system are you using? I don't think it supports IO polling.
io_uring actually checks for this, with preadv you just get normal
schedule based IO.
--
Jens Axboe
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