Latency spikes on Dell Optiplex 7060 (i5 8500/32GB Ram, Radeon R5 430)

tommylight wrote:

Servo period "must" be 1000000 (1 million), changing it changes a lot of other stuff like PID values.
 

But I am trying to run 8kHz thread to match with my Delta B3 EtherCAT cycle time.

Ah, Ethercat. Have you seen this (says in the comments that he has not been able to run 8kHz with the newer 6.xx kernel):


 

Yes, I have seen probably all linuxcnc videos on youtube
I was hoping that after two years, technology has advanced so much, that it should be possible to run 8kHz again.

check out latest overnight tests (with internet disconnected - no usb wifi adapter or ethernet connection):

 

 
 

zmrdko wrote:

But I am trying to run 8kHz thread to match with my Delta B3 EtherCAT cycle time.

Should be doable, i did 4kHz easily, so give this a try on a fresh install:
forum.linuxcnc.org/38-general-linuxcnc-q...ead-and-irq-affinity

tommylight wrote:

zmrdko wrote:

But I am trying to run 8kHz thread to match with my Delta B3 EtherCAT cycle time.
Should be doable, i did 4kHz easily, so give this a try on a fresh install:
forum.linuxcnc.org/38-general-linuxcnc-q...ead-and-irq-affinity
 

Let me know how it went. Maybe we can compare hardware and do the same tests.
I have bought PS2 keyboard and mouse on saturday.
I was thinking about getting non-ecc unbuffered RAM, but now when I think about it, I dont have bad latency. The only problem is ad hoc latency spike, which will probably not be solved by faster RAM..

Overnight test with disconnected internet and using new ps2 peripherals ended up with one minor 29us spike


Is there a way to trace it?
Is it worth to worry about it?