pre_read fixes

[fio.git] / fio.1

diff --git a/fio.1 b/fio.1
index 38341b3191448f67f81adc23c589542b8fd75aee..2d6ab9576a97a1a9e91f04a21d7ebd05643c0465 100644 (file)
--- a/fio.1
+++ b/fio.1
@@ -187,15 +187,18 @@ block sizes for exact control of the issued IO for a job that has mixed
 block sizes. The format of the option is bssplit=blocksize/percentage,
 optionally adding as many definitions as needed seperated by a colon.
 Example: bssplit=4k/10:64k/50:32k/40 would issue 50% 64k blocks, 10% 4k
-blocks and 40% 32k blocks.
+blocks and 40% 32k blocks. \fBbssplit\fR also supports giving separate
+splits to reads and writes. The format is identical to what the
+\fBbs\fR option accepts, the read and write parts are separated with a
+comma.
 .TP
 .B blocksize_unaligned\fR,\fP bs_unaligned
 If set, any size in \fBblocksize_range\fR may be used.  This typically won't
 work with direct I/O, as that normally requires sector alignment.
 .TP
 .BI blockalign \fR=\fPint[,int] "\fR,\fB ba" \fR=\fPint[,int]
-At what boundary to align random IO offsets. Defaults to the same as
-'blocksize' the minimum blocksize given.  Minimum alignment is typically 512b
+At what boundary to align random IO offsets. Defaults to the same as 'blocksize'
+the minimum blocksize given.  Minimum alignment is typically 512b
 for using direct IO, though it usually depends on the hardware block size.
 This option is mutually exclusive with using a random map for files, so it
 will turn off that option.