+.BI buffer_compress_percentage \fR=\fPint
+If this is set, then fio will attempt to provide IO buffer content (on WRITEs)
+that compress to the specified level. Fio does this by providing a mix of
+random data and a fixed pattern. The fixed pattern is either zeroes, or the
+pattern specified by \fBbuffer_pattern\fR. If the pattern option is used, it
+might skew the compression ratio slightly. Note that this is per block size
+unit, for file/disk wide compression level that matches this setting. Note
+that this is per block size unit, for file/disk wide compression level that
+matches this setting, you'll also want to set refill_buffers.
+.TP
+.BI buffer_compress_chunk \fR=\fPint
+See \fBbuffer_compress_percentage\fR. This setting allows fio to manage how
+big the ranges of random data and zeroed data is. Without this set, fio will
+provide \fBbuffer_compress_percentage\fR of blocksize random data, followed by
+the remaining zeroed. With this set to some chunk size smaller than the block
+size, fio can alternate random and zeroed data throughout the IO buffer.
+.TP
+.BI buffer_pattern \fR=\fPstr
+If set, fio will fill the IO buffers with this pattern. If not set, the contents
+of IO buffers is defined by the other options related to buffer contents. The
+setting can be any pattern of bytes, and can be prefixed with 0x for hex
+values. It may also be a string, where the string must then be wrapped with
+"", e.g.:
+.RS
+.RS
+\fBbuffer_pattern\fR="abcd"
+.RS
+or
+.RE
+\fBbuffer_pattern\fR=-12
+.RS
+or
+.RE
+\fBbuffer_pattern\fR=0xdeadface
+.RE
+.LP
+Also you can combine everything together in any order:
+.LP
+.RS
+\fBbuffer_pattern\fR=0xdeadface"abcd"-12
+.RE
+.RE
+.TP
+.BI dedupe_percentage \fR=\fPint
+If set, fio will generate this percentage of identical buffers when writing.
+These buffers will be naturally dedupable. The contents of the buffers depend
+on what other buffer compression settings have been set. It's possible to have
+the individual buffers either fully compressible, or not at all. This option
+only controls the distribution of unique buffers.
+.TP