The Kasli SoC is much stronger than the Kasli in several metrics, as explained in:
Lam et al., Combining processing throughput, low latency and timing accuracy in experiment control (2021)
Practical example:
- An important metric is how long an empty RPC call takes, see for example the code and the histograms in artiq/issues/2601.
- In December 2024, we repeated this measurement with a Kasli SoC v1.1.1 and a Kasli v2.0.1. We flashed them separately with the latest firmware on artiq
release-8 and measured histograms with 10,000 empty RPC calls.
- The Kasli SoC's histogram was peaked at 160 microseconds and fully contained between 100 and 250 microseconds per RPC call, whereas
- the Kasli's histogram was peaked and mostly contained between 1300 and 1400 microseconds per RPC call.
- Clearly, the Kasli SoC is better by almost a factor 10 and, clearly, one should upgrade their master device from a Kasli to a Kasli SoC.
Questions:
- Will the above speed-up also translate to master-satellite communication via the SFP ports?
- If we run all of our kernels on the master, does it still make sense to upgrade the satellite devices from Kasli to Kasli SoC? Why yes? Why no?