Merge branch 'replay-blktrace-fixes' of https://github.com/shimrot/fio

[fio.git] / fio.1

diff --git a/fio.1 b/fio.1
index 3e872bcea7ce332ab3c07060c0b24d06bc51b930..6685e50790b320d5c404c3954b9840213931e30e 100644 (file)
--- a/fio.1
+++ b/fio.1
@@ -112,8 +112,8 @@ only applies to job sections. The reserved *global* section is always
 parsed and used.
 .TP
 .BI \-\-alloc\-size \fR=\fPkb
-Set the internal smalloc pool size to \fIkb\fR in KiB. The
-\fB\-\-alloc\-size\fR switch allows one to use a larger pool size for smalloc.
+Allocate additional internal smalloc pools of size \fIkb\fR in KiB. The
+\fB\-\-alloc\-size\fR option increases shared memory set aside for use by fio.
 If running large jobs with randommap enabled, fio can run out of memory.
 Smalloc is an internal allocator for shared structures from a fixed size
 memory pool and can grow to 16 pools. The pool size defaults to 16MiB.
@@ -1050,7 +1050,7 @@ see \fBend_fsync\fR and \fBfsync_on_close\fR.
 .TP
 .BI fdatasync \fR=\fPint
 Like \fBfsync\fR but uses \fBfdatasync\fR\|(2) to only sync data and
-not metadata blocks. In Windows, FreeBSD, and DragonFlyBSD there is no
+not metadata blocks. In Windows, FreeBSD, DragonFlyBSD or OSX there is no
 \fBfdatasync\fR\|(2) so this falls back to using \fBfsync\fR\|(2).
 Defaults to 0, which means fio does not periodically issue and wait for a
 data\-only sync to complete.
@@ -1791,6 +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