UHD Performance/Lock Contention

[ZeroDawn]

Hi,

I ran a test receiving a single redundant UHD stream, however, I was unable to receive it without performance drops. Seeing plenty of hw_dropped_packets:

System Specs:

• AMD EPYC 9354P 32-Core Processor (w/ Hyperthreading)
• 6x 16GB DDR5 RAM
• 2x E810 XXV 25G
• Ubuntu 22.04, Kernel 5.15.0.179
• Kernel Parameters: "isolcpus=61-63 irq_affinity=0-60 rcu_nocbs=61-63 iommu=pt amd_iommu=on"

Anything else we can check to see why we don't see good performance here?

Thanks

[DawidWesierski4]

We specialize in Intel-based systems and currently lack the AMD testing infrastructure required to provide support for your hardware configuration.

This generally looks like back pressure from Memory buffers being taken so i would start with utilizing AMD's equivalent performance monitoring tools (anything similar to Intel PCM) to identify system bottlenecks during execution.

[ZeroDawn]

Ah yeah, I sent a message in chat but didn't updated the issue here. Looks to be lock contention related again:

4ms stall in rv_slot_by_timestamp

[Sakoram]

Hi, #1627 should fix this issue. Could you please check if you can still reproduce it on current main?

[DianaEs2]

Validation is blocked by another issue, CI #1678.