For whoever is using Stretch with preempt-rt, add more memory, a lot more memory.
This was tested on a Dell Optiplex 790, with 2Gb or ram it did 110000 in latency, with 8 GB it does 44000.
Edited the model number, it was written as 780.
Last edit: 7 years 11 months ago by tommylight. Reason: Error in model number
Memory should have no effect, unless it's some memory bank issue that 8GB allows parallel access to different banks and 2GB doesn't? Many motherboards have two different colored memory slots, you need to fill them in correct order to get full memory speed.
I have been using stretch for a year now. I too needed to increase jitter values quite a lot. But this is my daily desktop machine, so it's a trade off between linuxcnc and other work, and I feel that it's still worth it.
Fixed the model number of the Dell computer, i own plenty of 780 so i wrote that by mistake.
The test was done on a 790.
Unfortunately leaving the latency test on while the PC is on an in use for several days, it occasionally gets the 200000 range spikes.
