Mention default values for readwrite=/ioengine=/mem= in documentation

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index ab25cb2796ddafeec8b375fe832c61825238fe81..ca1542d5fdf88b7fa0e6e607ab019a98c5d2d770 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -405,6 +405,7 @@ rw=str              Type of io pattern. Accepted values are:
                        trimwrite       Mixed trims and writes. Blocks will be
                                        trimmed first, then written to.
 
+               Fio defaults to read if the option is not specified.
                For the mixed io types, the default is to split them 50/50.
                For certain types of io the result may still be skewed a bit,
                since the speed may be different. It is possible to specify
@@ -699,7 +700,8 @@ ioengine=str        Defines how the job issues io to the file. The following
                        sync    Basic read(2) or write(2) io. lseek(2) is
                                used to position the io location.
 
-                       psync   Basic pread(2) or pwrite(2) io.
+                       psync   Basic pread(2) or pwrite(2) io. Default on all
+                               supported operating systems except for Windows.
 
                        vsync   Basic readv(2) or writev(2) IO.
 
@@ -717,6 +719,7 @@ ioengine=str        Defines how the job issues io to the file. The following
                        solarisaio Solaris native asynchronous io.
 
                        windowsaio Windows native asynchronous io.
+                               Default on Windows.
 
                        mmap    File is memory mapped and data copied
                                to/from using memcpy(3).
@@ -1221,6 +1224,7 @@ mem=str           Fio can use various types of memory as the io unit buffer.
                The allowed values are:
 
                        malloc  Use memory from malloc(3) as the buffers.
+                               Default memory type.
 
                        shm     Use shared memory as the buffers. Allocated
                                through shmget(2).