helper_thread: remove impossible branch

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index 9ed2c5f5580365c69664eecb651f7e1b4065df7b..67fd83376fd3beffe1bf62e0e204981f2815eff9 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -53,8 +53,8 @@ bottom, it contains the following basic parameters:
 
        IO engine       How do we issue io? We could be memory mapping the
                        file, we could be using regular read/write, we
 
        IO engine       How do we issue io? We could be memory mapping the
                        file, we could be using regular read/write, we

-                       could be using splice, async io, syslet, or even
-                       SG (SCSI generic sg).
+                       could be using splice, async io, or even SG
+                       (SCSI generic sg).

 
        IO depth        If the io engine is async, how large a queuing
                        depth do we want to maintain?
 
        IO depth        If the io engine is async, how large a queuing
                        depth do we want to maintain?


@@ -374,6 +374,11 @@ filename_format=str
                default of $jobname.$jobnum.$filenum will be used if
                no other format specifier is given.
 
                default of $jobname.$jobnum.$filenum will be used if
                no other format specifier is given.
 

+unique_filename=bool   To avoid collisions between networked clients, fio
+               defaults to prefixing any generated filenames (with a directory
+               specified) with the source of the client connecting. To disable
+               this behavior, set this option to 0.
+

 opendir=str    Tell fio to recursively add any file it can find in this
                directory and down the file system tree.
 
 opendir=str    Tell fio to recursively add any file it can find in this
                directory and down the file system tree.
 


@@ -701,7 +706,9 @@ ioengine=str        Defines how the job issues io to the file. The following
 
                        vsync   Basic readv(2) or writev(2) IO.
 
 
                        vsync   Basic readv(2) or writev(2) IO.
 

-                       psyncv  Basic preadv(2) or pwritev(2) IO.
+                       pvsync  Basic preadv(2) or pwritev(2) IO.
+
+                       pvsync2 Basic preadv2(2) or pwritev2(2) IO.

 
                        libaio  Linux native asynchronous io. Note that Linux
                                may only support queued behaviour with
 
                        libaio  Linux native asynchronous io. Note that Linux
                                may only support queued behaviour with


@@ -721,9 +728,6 @@ ioengine=str        Defines how the job issues io to the file. The following
                                vmsplice(2) to transfer data from user
                                space to the kernel.
 
                                vmsplice(2) to transfer data from user
                                space to the kernel.
 

-                       syslet-rw Use the syslet system calls to make
-                               regular read/write async.
-

                        sg      SCSI generic sg v3 io. May either be
                                synchronous using the SG_IO ioctl, or if
                                the target is an sg character device
                        sg      SCSI generic sg v3 io. May either be
                                synchronous using the SG_IO ioctl, or if
                                the target is an sg character device