On Thu, May 26, 2022 at 08:18:06PM +0530, Ankit Kumar wrote:
.B libaio Linux native asynchronous I/O. Note that Linux may only support queued behavior with non-buffered I/O (set `direct=1' or @@ -2045,6 +2054,15 @@ release them when IO is done. If this option is set, the pages are pre-mapped before IO is started. This eliminates the need to map and release for each IO. This is more efficient, and reduces the IO latency as well. .TP +.BI (io_uring,io_uring_cmd)nonvectored +With this option, fio will use non-vectored read/write commands, where address +must contain the address directly. +.TP +.BI (io_uring,io_uring_cmd)force_async +Normal operation for io_uring is to try and issue an sqe as non-blocking first, +and if that fails, execute it in an async manner. With this option set to N, +then every N request fio will ask sqe to be issued in an async manner. +.TP .BI (io_uring,xnvme)hipri
io_uring_cmd should be added here? And same for fixedbufs too.
If this option is set, fio will attempt to use polled IO completions. Normal IO completions generate interrupts to signal the completion of IO, polled @@ -2052,22 +2070,26 @@ completions do not. Hence they are require active reaping by the application. The benefits are more efficient IO for high IOPS scenarios, and lower latencies for low queue depth IO. .TP -.BI (io_uring)registerfiles +.BI (io_uring,io_uring_cmd)registerfiles With this option, fio registers the set of files being used with the kernel. This avoids the overhead of managing file counts in the kernel, making the submission and completion part more lightweight. Required for the below sqthread_poll option. .TP -.BI (io_uring,xnvme)sqthread_poll +.BI (io_uring,io_uring_cmd,xnvme)sqthread_poll Normally fio will submit IO by issuing a system call to notify the kernel of available items in the SQ ring. If this option is set, the act of submitting IO will be done by a polling thread in the kernel. This frees up cycles for fio, at the cost of using more CPU in the system. .TP -.BI (io_uring)sqthread_poll_cpu +.BI (io_uring,io_uring_cmd)sqthread_poll_cpu When `sqthread_poll` is set, this option provides a way to define which CPU should be used for the polling thread. .TP +.BI (io_uring_cmd)cmd_type \fR=\fPstr +Specifies the type of uring passthrough command to be used. Supported +value is nvme.
Seems that is default value too. So that part needs to be mentioned here.
