Properly initialize md5 hash seed

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index 2797a58c3da2bbe6c240f039753ff52b0bb76265..58e12819e7f5868f5adb12eac6e5949784266227 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -170,7 +170,8 @@ Some parameters take an option of a given type, such as an integer or
 a string. The following types are used:
 
 str    String. This is a sequence of alpha characters.
-int    Integer. A whole number value, can be negative.
+int    Integer. A whole number value, can be negative. If prefixed with
+       0x, the integer is assumed to be of base 16 (hexidecimal).
 siint  SI integer. A whole number value, which may contain a postfix
        describing the base of the number. Accepted postfixes are k/m/g,
        meaning kilo, mega, and giga. So if you want to specify 4096,
@@ -603,10 +604,22 @@ verifysort=bool   If set, fio will sort written verify blocks when it deems
                fast IO where the red-black tree sorting CPU time becomes
                significant.
 
-header_interval=siint  Write the verification header at a finer granularity
+verify_offset=siint    Swap the verification header with data somewhere else
+                       in the block before writing. Its swapped back before
+                       verifying.
+
+verify_interval=siint  Write the verification header at a finer granularity
                        than the blocksize. It will be written for chunks the
                        size of header_interval. blocksize should divide this
                        evenly.
+
+verify_pattern=int     If set, fio will fill the io buffers with this
+               pattern. Fio defaults to filling with totally random
+               bytes, but sometimes it's interesting to fill with a known
+               pattern for io verification purposes. Depending on the
+               width of the pattern, fio will fill 1/2/3/4 bytes of the
+               buffer at the time. The verify_pattern cannot be larger than
+               a 32-bit quantity.
                
 stonewall      Wait for preceeding jobs in the job file to exit, before
                starting this one. Can be used to insert serialization