Increase RR scheduler priority to 20, to avoid dropped bursts

If frames are not deliverd fast enough to the DSP, bursts will get
dropped. The osmo-bts-sysmo process must have priority over other
processes, so it can deliver frames fast enough.

Related: OS#6199
Change-Id: I2394e6bbc00a1d47987dbe7b70f4b5cbedf69b10
(cherry picked from commit d265ce68b24b1c3ed95f328f9fe8bec6e5396c5a)
---
M contrib/systemd/osmo-bts-sysmo.service
1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/contrib/systemd/osmo-bts-sysmo.service b/contrib/systemd/osmo-bts-sysmo.service
index 09e91de..3d99655 100644
--- a/contrib/systemd/osmo-bts-sysmo.service
+++ b/contrib/systemd/osmo-bts-sysmo.service
@@ -17,7 +17,7 @@
 # CPU scheduling policy:
 CPUSchedulingPolicy=rr
 # For real-time scheduling policies an integer between 1 (lowest priority) and 99 (highest priority):
-CPUSchedulingPriority=11
+CPUSchedulingPriority=20
 # See sched(7) for further details on real-time policies and priorities
 
 [Install]

