Fix bug in md5 calculation

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index 4d103c846a4d7945f5cdb19d18a27c8b4139760c..8cb849c7c6edad0ddf70294d98f3084cd2894a5a 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -343,6 +343,9 @@ ioengine=str        Defines how the job issues io to the file. The following
                                or receive, if the latter only the port
                                argument is used.
 
+                       netsplice Like net, but uses splice/vmsplice to
+                               map data and send/receive.
+
                        cpu     Doesn't transfer any data, but burns CPU
                                cycles according to the cpuload= and
                                cpucycle= options. Setting cpuload=85
@@ -571,9 +574,19 @@ verify=str If writing to a file, fio can verify the file contents
                        md5     Use an md5 sum of the data area and store
                                it in the header of each block.
 
+                       crc64   Use an experimental crc64 sum of the data
+                               area and store it in the header of each
+                               block.
+
                        crc32   Use a crc32 sum of the data area and store
                                it in the header of each block.
 
+                       crc16   Use a crc16 sum of the data area and store
+                               it in the header of each block.
+
+                       crc7    Use a crc7 sum of the data area and store
+                               it in the header of each block.
+
                        null    Only pretend to verify. Useful for testing
                                internals with ioengine=null, not for much
                                else.
@@ -589,6 +602,15 @@ verifysort=bool    If set, fio will sort written verify blocks when it deems
                can ignore this option unless doing huge amounts of really
                fast IO where the red-black tree sorting CPU time becomes
                significant.
+
+header_offset=siint    Swap the verification header with data somewhere else
+                       in the block before writing. Its swapped back before
+                       verifying.
+
+header_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.
                
 stonewall      Wait for preceeding jobs in the job file to exit, before
                starting this one. Can be used to insert serialization
@@ -694,9 +716,10 @@ E          Thread exited, not reaped by main thread yet.
 _              Thread reaped.
 
 The other values are fairly self explanatory - number of threads
-currently running and doing io, rate of io since last check, and the estimated
-completion percentage and time for the running group. It's impossible to
-estimate runtime of the following groups (if any).
+currently running and doing io, rate of io since last check (read speed
+listed first, then write speed), and the estimated completion percentage
+and time for the running group. It's impossible to estimate runtime of
+the following groups (if any).
 
 When fio is done (or interrupted by ctrl-c), it will show the data for
 each thread, group of threads, and disks in that order. For each data