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Merge pull request #99 from bondagit/issue-96

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Issue 96
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Andrea Bondavalli 2022-11-18 09:24:10 +01:00 committed by GitHub
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21
README.md
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@ -121,10 +121,13 @@ The following ARM platform have been used for testing:
The BeagleBone® Black board with ARM Cortex-A8 32-Bit processor.
See [Ubuntu 18.04 on BeagleBone® Black](https://elinux.org/BeagleBoardUbuntu) for additional information about how to setup Ubuntu on this board.
The NanoPi NEO2 with Allwinner H5, Quad-core 64-bit high-performance Cortex A53 processor.
The NanoPi NEO2 with Allwinner H5 Quad-core 64-bit Cortex A53 processor.
See [Armbian NanoPi NEO2 ](https://www.armbian.com/nanopi-neo-2/) for additional information about how to setup Ubuntu on this board.
The [ubuntu-packages.sh](ubuntu-packages.sh) script can be used to install all the packages required to compile and run the AES67 daemon, and the [platform compatibility test](#test).
**_Important_** CPU scaling events could affect daemon streams causing unexpected distortions, see [CPU scaling events and scripts notes](#notes).
**_Important_** _PulseAudio_ must be disabled or uninstalled for the daemon to work properly, see [PulseAudio and scripts notes](#notes).
## How to build ##
@ -267,6 +270,22 @@ make sure that no instances of the aes67-daemon are running, enter the [tests](d
* All the scripts in this repository are provided as a reference to help setting up the system and run the platform compatibility test.
They have been tested on **Ubuntu 18.04 19.10 20.04** distros.
* CPU scaling events could have an impact on daemon streams causing unexpected distortion for a few seconds, see #96.
Before running the daemon make sure you disable CPU scaling events:
Check if CPU scaling is enabled with:
cat /proc/sys/kernel/perf_cpu_time_max_percent
If result is not 0, (it's usually set to 25) set it to 0 with:
sudo sysctl -w kernel.perf_cpu_time_max_percent=0
You may also want to review the current CPU scaling governor with (cpu0 in this case):
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
See https://www.kernel.org/doc/Documentation/cpu-freq/governors.txt for dditional info.
* **PulseAudio** can create instability problems.
Before running the daemon verify that PulseAudio is not running with:

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daemon/scripts/disable_cpu_scaling.sh Executable file
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@ -0,0 +1,4 @@
#!/bin/bash
sudo sysctl -w kernel.perf_cpu_time_max_percent=0

1
run_latency_test.sh
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@ -107,6 +107,7 @@ trap cleanup EXIT
#configure system parms
sudo sysctl -w net/ipv4/igmp_max_memberships=66
sudo sysctl -w kernel/perf_cpu_time_max_percent=0
if [ -x /usr/bin/pulseaudio ]; then
#stop pulseaudio, this seems to open/close ALSA continuosly

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run_test.sh
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@ -94,6 +94,7 @@ trap cleanup EXIT
#configure system parms
sudo sysctl -w net/ipv4/igmp_max_memberships=66
sudo sysctl -w kernel/perf_cpu_time_max_percent=0
if [ -x /usr/bin/pulseaudio ]; then
#stop pulseaudio, this seems to open/close ALSA continuosly