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
