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

tommylight
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17 Feb 2024 00:02 #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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zmrdko
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17 Feb 2024 08:03 #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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zmrdko
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17 Feb 2024 09:24 #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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zmrdko
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17 Feb 2024 11:24 #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.

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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Aciera
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17 Feb 2024 13:26 #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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tommylight
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17 Feb 2024 14:02 #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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zmrdko
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18 Feb 2024 09:44 - 18 Feb 2024 09:51 #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

Last edit: 18 Feb 2024 09:51 by zmrdko.

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zmrdko
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18 Feb 2024 09:47 #293674 by zmrdko

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

Aciera wrote:
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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zmrdko
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18 Feb 2024 09:51 #293675 by zmrdko

Replied by zmrdko on topic 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.

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Aciera
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18 Feb 2024 10:41 - 18 Feb 2024 10:43 #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):

Last edit: 18 Feb 2024 10:43 by Aciera.

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

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