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20 Jul 2022 11:09 #247832 by JT
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After running latency-histogram --nobase all night I think I have a winner.


Thanks for your help Tommy.
JT
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20 Jul 2022 12:51 #247841 by tommylight
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forum.linuxcnc.org/18-computer/39371-res...cnc?start=310#247840

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20 Jul 2022 17:40 #247863 by tommylight
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I was not sure when i told you to get the 6600 graphic card as i do not follow much of it, i am glad i was right! :)
This is against a 3050, a much, much better than the 1650 you were looking at, and still the 6600 wins by a large margin.

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20 Jul 2022 21:18 #247879 by JT
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The AMD Radeon RX 6600 is a beast to say the least and I'm happy so far with it... maybe I need to start playing games in the morning with my coffee instead of programming...

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21 Jul 2022 22:43 - 22 Jul 2022 05:49 #247993 by Bari
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Just for comparison. No BIOS tweaks on Sid.

ASUS TUF B450M-PLUS Gaming MB

We have a newer RT kernel and with the BIOS settings and isolcpus the same hardware is at 33uS worst case on the base thread. Will post a pic later.

 

Same ASUS TUF B450M-PLUS Gaming MB with same kernel as above but with isolcpus=1,2,3
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Last edit: 22 Jul 2022 05:49 by Bari. Reason: MB part number and more info
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21 Jul 2022 23:59 #247996 by Bari
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Another comparison with 5.18 rt kernel but older AMD CPU and MB.
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22 Jul 2022 12:03 #248024 by JT
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I think I'll try Debian unstable in the morning. I have a PCIe NIC installed so that's not an issue like it was before.

Did you install Debian 11 then change the apt sources to point to unstable?

JT

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22 Jul 2022 14:48 #248039 by Bari
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Yes, I have installed from Deb11 and then changed the sources to unstable.

The big difference in the latency numbers for the Ryzen system above is with and without the use of isolcpus. Using isolcpus reduced jitter by 3-4x.
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23 Jul 2022 10:01 #248104 by JT
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I installed Debian 11.4 and it doesn't recognize the video card so stuck at 800x600.

Upgrading to unstable to see what I get.

JT

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23 Jul 2022 10:46 #248108 by tommylight
Replied by tommylight on topic Current Motherboards
You can install the AMD drivers for it, it is easy as they provide them in full and the process is streamlined a lot.

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