os/os-linux.h: fix broken byte swap intrinsics

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index cae95b7720f210893bb7b89a5b445ba61a980bf5..d9e881abdcc3aa2495cc18957d3b4c681d943f8d 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -543,6 +543,8 @@ Parameter types
 
        If the option accepts an upper and lower range, use a colon ':' or
        minus '-' to separate such values. See :ref:`irange <irange>`.
+       If the lower value specified happens to be larger than the upper value,
+       two values are swapped.
 
 .. _bool:
 
@@ -1466,6 +1468,9 @@ Buffers and memory
                **mmapshared**
                        Same as mmap, but use a MMAP_SHARED mapping.
 
+               **cudamalloc**
+                       Use GPU memory as the buffers for GPUDirect RDMA benchmark.
+
        The area allocated is a function of the maximum allowed bs size for the job,
        multiplied by the I/O depth given. Note that for **shmhuge** and
        **mmaphuge** to work, the system must have free huge pages allocated. This
@@ -1673,6 +1678,11 @@ I/O engine
                        DDIR_TRIM
                                does fallocate(,mode = FALLOC_FL_KEEP_SIZE|FALLOC_FL_PUNCH_HOLE).
 
+               **ftruncate**
+                       I/O engine that sends :manpage:`ftruncate(2)` operations in response
+                       to write (DDIR_WRITE) events. Each ftruncate issued sets the file's
+                       size to the current block offset. Block size is ignored.
+
                **e4defrag**
                        I/O engine that does regular EXT4_IOC_MOVE_EXT ioctls to simulate
                        defragment activity in request to DDIR_WRITE event.