On 17.11.22 22:02, Dave Taht wrote:
time sensitive networking is a thing. Now less sensitive. At least on
this a53, an interrupt rate of 20us resulted in total cpu usage at a
gbit...
Taking a 7x hit in latency tho, to reduce the cpu load, strikes me as
a lot. dpdk would just spin-read here, vs a vs xdp.
7x less interrupts does not mean that latency is also 7x higher, but
latency will definitely be increased. A balance between CPU load and
latency need to be found here.
"Without interrupt throttling, iperf server mode generates a CPU load of
100% (A53 1.2GHz). Also the throughput suffers with less than 900Mbit/s
on a 1Gbit/s link. The reason is a high interrupt load with interrupts
every ~20us.
Reduce interrupt load by throttling of interrupts. Interrupt delay is
configured statically to 64us. For iperf server mode the CPU load is
significantly reduced to ~20% and the throughput reaches the maximum of
941MBit/s. Interrupts are generated every ~140us."
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