(resending, as my phone email client turned this into html crap) > Hi Bart, > > I configured 5.0-rc6 and had a look at the io_uring code. Finally worked out how to use FIO's t/io_uring to submit IO and poll completions without system calls. My _initial_ numbers still show SPDK being faster and more efficient. > > Searching the lists, I found a few mentions that Jens published a comparison stating otherwise, but I can't find it. Could you please give me some pointers? I posted some numbers with v5: https://lore.kernel.org/linux-block/20190116175003.17880-1-axboe@xxxxxxxxx/ Sounds like you are using sqpoll, you probably don’t want to do that for peak performance. And you probably want to experiment a bit to reach the best performance, both in terms of setup/placement and kernel configuration, runtime options (like iostats), etc. -- Jens Axboe
