Benchmark

Raspberry Pi 4

Date: 12.02.2021 Version: 2.1.0 (non-public release)

Goal: Bandwidth Limitation Test (HLS Sessions)

Settings

Core enviroments

ENV

CORE_SESSION_BANDWIDTH_LIMIT=800

Kernel tuning

sysctl -w net.core.netdev_budget_usecs=60000
sysctl -w net.core.netdev_budget=900
sysctl -w net.core.rmem_max=26214400
sysctl -w net.core.wmem_max=2621440

Network tunung

echo "6" > /proc/irq/33/smp_affinity
echo "1-2" > /proc/irq/33/smp_affinity_list
echo c > /sys/class/net/eth0/queues/rx-0/rps_cpus
echo c > /sys/class/net/eth1/queues/rx-0/rps_cpus
echo c > /sys/class/net/eth0/queues/tx-0/xps_cpus
echo c > /sys/class/net/eth0/queues/tx-1/xps_cpus
echo c > /sys/class/net/eth0/queues/tx-2/xps_cpus
echo c > /sys/class/net/eth0/queues/tx-3/xps_cpus
echo c > /sys/class/net/eth0/queues/tx-4/xps_cpus
/sbin/ethtool -K eth0 rx-checksum on
/sbin/ethtool -K eth1 rx-checksum on

Knowledge

BIFRÖST Part 2 - RPi 4B Hybrid Bridging Router - Tuning Linux Network for Gigabit Line SpeedLinkedInEditors

Results

Test 1

1x H.264 Encoding (1280x720, 1 Mbit/s)

Active HLS-Sessions: 696

Test 2

1x H.264 Encoding (1280x720, 2 Mbit/s)

Active HLS-Sessions: 350

Test 3

1x H.264 Encoding (1280x720, 4 Mbit/s)

Active HLS-Sessions: 184

The limitation was the network card, not the CPU, memory, or application.