On 8/16/21 8:50 AM, Ming Lei wrote: > On Mon, Aug 16, 2021 at 08:02:27PM +0800, Ming Lei wrote: >> Hello Guys, >> >> I tried to use the following script to run buffered io with io_uring, >> but looks it always complains with 'Operation not supported', and any >> idea to make it working? >> >> ++ /root/git/fio/fio --readonly --name=onessd --filename=/dev/nvme0n1 --filesize=16m --rw=randread --bs=4k --direct=0 --overwrite=0 --numjobs=1 --iodepth=1 --time_based=1 --runtime=1 --ioengine=io_uring --registerfiles --fixedbufs --hipri=1 --gtod_reduce=1 --group_reporting >> onessd: (g=0): rw=randread, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=io_uring, iodepth=1 >> fio-3.25-229-gdf9e8 >> Starting 1 process >> fio: io_u error on file /dev/nvme0n1: Operation not supported: read offset=1011712, buflen=4096 >> fio: pid=3278, err=95/file:io_u.c:1841, func=io_u error, error=Operation not supported >> >> onessd: (groupid=0, jobs=1): err=95 (file:io_u.c:1841, func=io_u error, error=Operation not supported): pid=3278: Mon Aug 16 12:01:17 2021 > > Just figured out that --hipri can't be applied for buffered IO. Yes, and we may want to catch that in fio setup. But hipri (polled IO) is only available with O_DIRECT. -- Jens Axboe
