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Merge pull request #102 from bondagit/issue-79

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Issue 79
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Andrea Bondavalli 2022-11-29 17:54:13 +01:00 committed by GitHub
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3 changed files with 16 additions and 2 deletions
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README.md
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@ -119,7 +119,7 @@ This directory contains the files used to run the daemon platform compatibility
## Prerequisite ##
<a name="prerequisite"></a>
The daemon and the test have been tested with **Ubuntu 18.04** distro on **ARMv7** and with **Ubuntu 18.04, 19.10 and 20.04** distros on **x86** using:
The daemon and the test have been verified starting from **Ubuntu 18.04** distro onwards for **ARMv7** and **x86** platforms using:
* Linux kernel version >= 4.10.x
* GCC version >= 7.x / clang >= 6.x (C++17 support required)
@ -139,6 +139,8 @@ The [ubuntu-packages.sh](ubuntu-packages.sh) script can be used to install all t
**_Important_** CPU scaling events could affect daemon streams causing unexpected distortions, see [CPU scaling events and scripts notes](#notes).
**_Important_** Starting from Linux kernel 5.10.x onwards a change in a kernel parameter is required to fix a problem with round robin scheduler causing the latency test to fail, see [Real Time Scheduler Throttling](#notes).
**_Important_** _PulseAudio_ must be disabled or uninstalled for the daemon to work properly, see [PulseAudio and scripts notes](#notes).
## How to build ##
@ -261,6 +263,8 @@ In case underrun happened the status reported is:
and the specified buffer size cannot be used.
**_Important_** Starting from Linux kernel 5.10.x onwards a change in a kernel parameter is required to fix a problem with round robin scheduler causing the latency test to fail, see [Real Time Scheduler Throttling](#notes).
## Run the daemon regression tests ##
To run daemon regression tests install the ALSA RAVENNA/AES67 kernel module with:
@ -280,7 +284,15 @@ make sure that no instances of the aes67-daemon are running, enter the [tests](d
<a name="notes"></a>
* 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.
They have been tested starting from **Ubuntu 18.04** distros onwards.
* Starting from Linux kernel 5.10.x onwards a change in a kernel parameter is required to fix a problem with round robin scheduler causing the latency test to fail, see [issue 79](https://github.com/bondagit/aes67-linux-daemon/issues/96) and alsa-lib [issue-285](https://github.com/alsa-project/alsa-lib/issues/285).
Set the total bandwidth available to all real-time tasks to 100% of the CPU with:
sysctl -w kernel.sched_rt_runtime_us=1000000
By default this value is set to 95%.
* CPU scaling events could have an impact on daemon streams causing unexpected distortion for a few seconds, see [issue 96](https://github.com/bondagit/aes67-linux-daemon/issues/96).
Before running the daemon make sure you disable CPU scaling events:

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run_latency_test.sh
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@ -108,6 +108,7 @@ 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
sudo sysctl -w kernel/sched_rt_runtime_us=1000000
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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@ -95,6 +95,7 @@ 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
sudo sysctl -w kernel/sched_rt_runtime_us=1000000
if [ -x /usr/bin/pulseaudio ]; then
#stop pulseaudio, this seems to open/close ALSA continuosly