engines/io_uring: add support for registered files

[fio.git] / fio.1

diff --git a/fio.1 b/fio.1
index d7421eee6267b1877e557b0a6afc7979e481b5b0..e0283f7f93ce8030ea3f82a21a7222fbcee1e6f1 100644 (file)
--- a/fio.1
+++ b/fio.1
@@ -753,7 +753,10 @@ restricted to a single zone.
 .RE
 .TP
 .BI zonerange \fR=\fPint
-Size of a single zone. See also \fBzonesize\fR and \fBzoneskip\fR.
+For \fBzonemode\fR=strided, this is the size of a single zone. See also
+\fBzonesize\fR and \fBzoneskip\fR.
+
+For \fBzonemode\fR=zbd, this parameter is ignored.
 .TP
 .BI zonesize \fR=\fPint
 For \fBzonemode\fR=strided, this is the number of bytes to transfer before
@@ -762,13 +765,21 @@ skipping \fBzoneskip\fR bytes. If this parameter is smaller than
 will be accessed.  If this parameter is larger than \fBzonerange\fR then each
 zone will be accessed multiple times before skipping to the next zone.
 
-For \fBzonemode\fR=zbd, this is the size of a single zone. The \fBzonerange\fR
-parameter is ignored in this mode.
+For \fBzonemode\fR=zbd, this is the size of a single zone. The
+\fBzonerange\fR parameter is ignored in this mode. For a job accessing a
+zoned block device, the specified \fBzonesize\fR must be 0 or equal to the
+device zone size. For a regular block device or file, the specified
+\fBzonesize\fR must be at least 512B.
 .TP
 .BI zoneskip \fR=\fPint
 For \fBzonemode\fR=strided, the number of bytes to skip after \fBzonesize\fR
-bytes of data have been transferred. This parameter must be zero for
-\fBzonemode\fR=zbd.
+bytes of data have been transferred.
+
+For \fBzonemode\fR=zbd, the \fBzonesize\fR aligned number of bytes to skip
+once a zone is fully written (write workloads) or all written data in the
+zone have been read (read workloads). This parameter is valid only for
+sequential workloads and ignored for random workloads. For read workloads,
+see also \fBread_beyond_wp\fR.
 
 .TP
 .BI read_beyond_wp \fR=\fPbool
@@ -1780,6 +1791,12 @@ 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)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)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