[PATCH] Don't segfault on missing argument data

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index 1e1f4097f54218e8c9d70e9479aecc9bf62c635d..1176d2287f815439c680a38249a104682fcae64a 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -224,7 +224,9 @@ bs=siint    The block size used for the io units. Defaults to 4k. Values
                after a comma, it will apply to writes only. In other words,
                the format is either bs=read_and_write or bs=read,write.
                bs=4k,8k will thus use 4k blocks for reads, and 8k blocks
-               for writes.
+               for writes. If you only wish to set the write size, you
+               can do so by passing an empty read size - bs=,8k will set
+               8k for writes and leave the read default value.
 
 bsrange=irange Instead of giving a single block size, specify a range
                and fio will mix the issued io block sizes. The issued