Update documentation on zero_buffers / scramble_buffers

Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/HOWTO b/HOWTO
index 725214fb4d14a0b2d0099f0106a8e2ad6822e7eb..0f9c0fc28bd4dfff82c07d35411203e47ed379aa 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -519,6 +519,8 @@ bs_is_seq_rand      If this option is set, fio will use the normal read,write
 
 zero_buffers   If this option is given, fio will init the IO buffers to
                all zeroes. The default is to fill them with random data.
 
 zero_buffers   If this option is given, fio will init the IO buffers to
                all zeroes. The default is to fill them with random data.

+               The resulting IO buffers will not be completely zeroed,
+               unless scramble_buffers is also turned off.

 
 refill_buffers If this option is given, fio will refill the IO buffers
                on every submit. The default is to only fill it at init
 
 refill_buffers If this option is given, fio will refill the IO buffers
                on every submit. The default is to only fill it at init

diff --git a/fio.1 b/fio.1
index 2dee56b524728d4bbf6a1b43773ae5989002f104..20f0c093acbd8f4f783ae736540259ce451ddbe4 100644 (file)
--- a/fio.1
+++ b/fio.1
@@ -430,6 +430,8 @@ blocksize setting.
 .TP
 .B zero_buffers
 Initialise buffers with all zeros. Default: fill buffers with random data.
 .TP
 .B zero_buffers
 Initialise buffers with all zeros. Default: fill buffers with random data.

+The resulting IO buffers will not be completely zeroed, unless
+\fPscramble_buffers\fR is also turned off.

 .TP
 .B refill_buffers
 If this option is given, fio will refill the IO buffers on every submit. The
 .TP
 .B refill_buffers
 If this option is given, fio will refill the IO buffers on every submit. The