Update HOWTO on cpumask setting

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

diff --git a/HOWTO b/HOWTO
index 167ed7c7f0adb472f186bee73d8d0d364e1484f3..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
 
 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
 
 startdelay=int Start this job the specified number of seconds after fio
                has started. Only useful if the job file contains several