bitbake: doc/bitbake-user-manual-ref-variables: update BB_TASK_IONICE_LEVEL

Provided example does not work due to two problems.

CFQ scheduler was removed in kernel 4.20 (per [1])
Replace it with BFQ scheduler.

Also fix typo "queu" -> "queue".

[1] https://en.wikipedia.org/wiki/I/O_scheduling

(Bitbake rev: 6716853e35ebc2e1523210a83b483cdacb600295)

Signed-off-by: Peter Marko <peter.marko@siemens.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/bitbake/doc/bitbake-user-manual/bitbake-user-manual-ref-variables.rst b/bitbake/doc/bitbake-user-manual/bitbake-user-manual-ref-variables.rst
index 1545c914cc..810f886897 100644
--- a/bitbake/doc/bitbake-user-manual/bitbake-user-manual-ref-variables.rst
+++ b/bitbake/doc/bitbake-user-manual/bitbake-user-manual-ref-variables.rst
@@ -770,11 +770,11 @@ overview of their function and contents.
       .. note::
 
          In order for your I/O priority settings to take effect, you need the
-         Completely Fair Queuing (CFQ) Scheduler selected for the backing block
+         Budget Fair Queuing (BFQ) Scheduler selected for the backing block
          device. To select the scheduler, use the following command form where
          device is the device (e.g. sda, sdb, and so forth)::
 
-            $ sudo sh -c "echo cfq > /sys/block/device/queu/scheduler"
+            $ sudo sh -c "echo bfq > /sys/block/device/queue/scheduler"
 
    :term:`BB_TASK_NICE_LEVEL`
       Allows specific tasks to change their priority (i.e. nice level).