Fio 1.16.2

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index 0b438714c56cba93b9f319178231b258bb2ee47e..5156adbe1e39c6ae738392e04467d155ee2abe57 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -465,7 +465,8 @@ ratecycle=int       Average bandwidth for 'rate' and 'ratemin' over this number
 
 cpumask=int    Set the CPU affinity of this job. The parameter given is a
                bitmask of allowed CPU's the job may run on. See man
-               sched_setaffinity(2).
+               sched_setaffinity(2). This may not work on all supported
+               operating systems or kernel versions.
 
 startdelay=int Start this job the specified number of seconds after fio
                has started. Only useful if the job file contains several
@@ -618,7 +619,12 @@ write_iolog=str    Write the issued io patterns to the specified file. See
 
 read_iolog=str Open an iolog with the specified file name and replay the
                io patterns it contains. This can be used to store a
-               workload and replay it sometime later.
+               workload and replay it sometime later. The iolog given
+               may also be a blktrace binary file, which allows fio
+               to replay a workload captured by blktrace. See blktrace
+               for how to capture such logging data. For blktrace replay,
+               the file needs to be turned into a blkparse binary data
+               file first (blktrace <device> -d file_for_fio.bin).
 
 write_bw_log   If given, write a bandwidth log of the jobs in this job
                file. Can be used to store data of the bandwidth of the