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

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2 years 8 months ago #293560 by tommylight
Replied by tommylight on topic Latency spikes on Dell Optiplex 7060 (i5 8500/32GB Ram, Radeon R5 430)
Can you please post this together with what you did here
forum.linuxcnc.org/18-computer/39371-res...or-use-with-linuxcnc
So it can be easily found.
Thank you.

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2 years 8 months ago #293585 by zmrdko
Replied by zmrdko on topic Latency spikes on Dell Optiplex 7060 (i5 8500/32GB Ram, Radeon R5 430)
I did fresh install again to verify and installing irqbalance was the thing that made all the difference.

I will post details as you asked.

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2 years 8 months ago #293597 by zmrdko
Replied by zmrdko on topic Latency spikes on Dell Optiplex 7060 (i5 8500/32GB Ram, Radeon R5 430)
 

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2 years 8 months ago #293603 by zmrdko
Replied by zmrdko on topic Latency spikes on Dell Optiplex 7060 (i5 8500/32GB Ram, Radeon R5 430)
OK, I was little overreacting.
 

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How does this makes sense?
servo-thread tmax is 128615, but even though I get error:Unexpected realtime delay on task0 with period 125000This Messagewill only display once persession.Run the Latency Test andresolve before continuing.p, li { white-space: pre-wrap; }

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2 years 8 months ago #293619 by Aciera
Replied by Aciera on topic Latency spikes on Dell Optiplex 7060 (i5 8500/32GB Ram, Radeon R5 430)
Latency is only one part, you also need to look at network latency. Look here:
forum.linuxcnc.org/49-basic-configuratio...ion-mesa-card#289479

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2 years 8 months ago #293622 by tommylight
Replied by tommylight on topic Latency spikes on Dell Optiplex 7060 (i5 8500/32GB Ram, Radeon R5 430)
Servo period "must" be 1000000 (1 million), changing it changes a lot of other stuff like PID values.

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2 years 8 months ago #293673 by zmrdko
Replied by zmrdko on topic Latency spikes on Dell Optiplex 7060 (i5 8500/32GB Ram, Radeon R5 430)
Unexpected realtime latency are very rare after some doing some more testing

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2 years 8 months ago #293674 by zmrdko
Replied by zmrdko on topic Latency spikes on Dell Optiplex 7060 (i5 8500/32GB Ram, Radeon R5 430)

Latency is only one part, you also need to look at network latency. Look here:
forum.linuxcnc.org/49-basic-configuratio...ion-mesa-card#289479
 
I'm running EtherCAT so I'm not sure network latency could be an issue here.

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2 years 8 months ago #293675 by zmrdko
Replied by zmrdko on topic Latency spikes on Dell Optiplex 7060 (i5 8500/32GB Ram, Radeon R5 430)

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.

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2 years 8 months ago #293678 by Aciera
Replied by Aciera on topic Latency spikes on Dell Optiplex 7060 (i5 8500/32GB Ram, Radeon R5 430)
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):


 

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