libaio: don't call io_destroy(), let exit_aio() take care of it

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index 6c7abcc7979d275a0bea276fd09deae69a587fec..60eab243caadf8c473166c0d56816adb5ffbc397 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -387,6 +387,8 @@ rw=str              Type of io pattern. Accepted values are:
                        randread        Random reads
                        rw,readwrite    Sequential mixed reads and writes
                        randrw          Random mixed reads and writes
+                       trimwrite       Mixed trims and writes. Blocks will be
+                                       trimmed first, then written to.
 
                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,
@@ -770,6 +772,15 @@ ioengine=str       Defines how the job issues io to the file. The following
                                necessary environment variables to work with
                                hdfs/libhdfs properly.
 
+                       mtd     Read, write and erase an MTD character device
+                               (e.g., /dev/mtd0). Discards are treated as
+                               erases. Depending on the underlying device
+                               type, the I/O may have to go in a certain
+                               pattern, e.g., on NAND, writing sequentially
+                               to erase blocks and discarding before
+                               overwriting. The writetrim mode works well
+                               for this constraint.
+
                        external Prefix to specify loading an external
                                IO engine object file. Append the engine
                                filename, eg ioengine=external:/tmp/foo.o
@@ -1721,6 +1732,7 @@ be the starting port number since fio will use a range of ports.
                1         : allocate space immidietly inside defragment event,
                            and free right after event
 
+[mtd] skip_bad=bool    Skip operations against known bad blocks.
 
 
 6.0 Interpreting the output