Comment by jauntywundrkind
1 day ago
Really nice!!!
I wonder if gigabit would make a difference on latency, faster packet transmissions. Could packets drop from 64 to 32b?
4ms is pretty good but I feel like sub 2ms would be nicer.
1 day ago
Really nice!!!
I wonder if gigabit would make a difference on latency, faster packet transmissions. Could packets drop from 64 to 32b?
4ms is pretty good but I feel like sub 2ms would be nicer.
Dante’s default latency compensation is 1ms: https://dev.audinate.com/GA/dante-controller/userguide/webhe...
> The typical default latency for a Dante audio device is 1 msec.
(emphasis mine)
The latency depends on the device. Hardware implementations of Dante commonly support latencies of 1ms or less, but software implementations are higher. The minimum latency of Dante Virtual Soundcard running on a PC is 4ms.
That's the appropriate number to compare against here (since the PC is using a software driver to interface with the network). However, that 4ms number is one-way latency, and the OP's 3.6ms number is round-trip. So this is already half the latency of DVS. (That being said, it sounds like this latency figure was only achieved in very ideal configurations, and we don't know the reliability/rate of late packets compared to DVS.)
Yep, thanks for clarifying about this!
1G would certainly decrease the processing latency (not the audio latency) by quite a bit. STM32H7 doesn't have a 1G MAC. 1G MAC is kind of rare on "friendly" microcontrollers, although there are at least two that I'm evaluating for the next project.
Sadly the H7 doesn't have a gigabit MAC. And most likely doing one over USB high speed host wouldn't help? But it would be an interesting experiment
https://semiengineering.com/latency-considerations-for-1-6t-...
It seems like, at 16000TbaseT anyways, you’re adding an overhead of about 150% on top of copper/fiber latency plus transmit time latency to process data at that bandwidth. I wonder if the same holds true at 100 vs 1000, 2500, 10000? Certainly this is a known tradeoff for DDR performance tuning — if you don’t mind spiking response times greatly, you can get the advertised maximum speeds, else you accept less bandwidth for somewhat less latency — and they’re both effectively using the same strategies to talk over copper.
One can fit a nice (eg, not 1-channel, but actually useable) LTE base station frontend in a gigabit eth on 2014-s tech.