Optiplex 755

zz912
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10 Mar 2023 18:28 - 10 Mar 2023 18:29 #266314 by zz912

Replied by zz912 on topic Optiplex 755

I am still testing 2ms thread.

Is 8 packet-error without "Latency error message" OK?

I have never followed this Hal Pin before. There was no reason.

Last edit: 10 Mar 2023 18:29 by zz912.

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PCW
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10 Mar 2023 18:42 #266315 by PCW

Replied by PCW on topic Optiplex 755

That's not not great, do you still have IRQ coalescing and AMT disabled?
This should always be done.

You might do better on that hardware with another kernel

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10 Mar 2023 19:04 #266318 by zz912

Replied by zz912 on topic Optiplex 755

I did not enabled IRQ or AMT.

Now I am trying change Kernel.

sudo apt install linux-headers-4.19.0-19-rt-amd64 linux-image-4.19.0-19-rt-amd64 linux-image-4.19.0-19-rt-amd64-dbg
sudo grub-customizer

I will continue on Monday

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zz912
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11 Mar 2023 11:42 #266396 by zz912

Replied by zz912 on topic Optiplex 755

Optiplex 7010
I tested my 7i96 and it had latency problem too. So I downgraded kernel, but this didnt help too.

It is weird. This computer with this Mesa card didnt have problems in past.
I guess something got updated and now it's messing up communication with Mesa.

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PCW
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11 Mar 2023 17:35 #266418 by PCW

Replied by PCW on topic Optiplex 755

Could also be a hardware failure of some kind

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JT
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15 Mar 2023 11:21 - 28 May 2023 14:15 #266742 by JT

Replied by JT on topic Optiplex 755

PCW wrote:
I think there is a bug in mesact

The servo thread tmax should show 75%

(100*1747291/2333333)

I can't figure out how you got 2333333 from 2333 MHz...

100(tmax/CPU_Speed*Servo_period)

So if tmax is 174729 and CPU speed is 2333 MHz and servo period is 1000000us what is the formula to arrive at 75%?

JT

Last edit: 28 May 2023 14:15 by JT.

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PCW
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15 Mar 2023 15:05 #266753 by PCW

Replied by PCW on topic Optiplex 755

2333333 is the number of CPU clocks per servo period

(2333333333*.001)

1747291 is the number of CPU clocks in the tmax value

1747291/2333333 = 0.748839107

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zz912
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18 May 2023 14:53 #271613 by zz912

Replied by zz912 on topic Optiplex 755

Hello,

I made test MesaCT with LCNC branche 2.9:

Then I made same test with LCNC branche busywait7:

It can be seen that branche busywait7 is better than branche 2.9. I was wondering if the busywait7 branch will ever be merged into the 2.9 branch?

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PCW
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18 May 2023 20:37 #271622 by PCW

Replied by PCW on topic Optiplex 755

Note that the latest available RT kernel (6.3.1-rt23)
seems better for network latency than earlier kernels.

I have tested it for about a week on 3 systems and have had no
packet errors at 1 KHz and now have it running at 2 KHz on one of
my better (latency wise) systems.

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Optiplex 755

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