Optiplex 755

Hello,

I have interesting problem. I have old computer. Everything is OK. Latency test is around 50 000. This is nice. But sometimes I get message about bad latency. So I made tests in MesaCT configurator:
 
The test went wrong. I do not want increase Servo Thread Period. 

Is my computer weak for Mesa? Can something be done about it? Or should I just order a more powerful PC.

I tried using only the basic configuration from PNCconf and using LCNC 2.8.0. The values improved, but only slightly.

Did you disable AMT in the BIOS?
Disable IRQ coalescing?

I think, coalescing is off: [/code]

Bios has not got anything like AMT.

Its in ME setup (needs a password) I think AMT is enabled by default on the 755

Is ME setup in BIOS?

Edit: ME is MEBx

Yes, you probably have to enable the MEBx message to access is through the BIOS setup
(and hope that the BIOS gives you access to AMT setup)

I disabled it, but it did not help.

Well its necessary but maybe not all that's needed

What kernel are you using?
(its known the the default Debian RT kernels are not very good)

Hello,

1) Kernel is in Pictures

2) I have new knowledge. We can rule out a Mesa card error. A latency-test is enough to simulate the problem. Look at the following picture:
 

As soon as I start the latency test, the message immediately starts:

In this image, I managed to simulate that the error message only appeared after a while. Nevertheless, the latency-test showed satisfactory values. Why?
 

3) I tested branche 2.8.0 and 2.9. Both is same.

 

A latency error may be expected with a 40 KHz
base thread but Its not too meaningful though because:

1. A base thread is not needed with Mesa hardware
2. The important thing is Ethernet latency which the latency test doesn't measure

You can get an idea of Ethernet latency with:

sudo chrt 99 ping -i .001 -q 10.10.10.10

(let run for a few minutes and then control-C)