Installing LinuxCNC On HP T610 Thin Client
17 Apr 2021 10:49 #206171
by Joco
Replied by Joco on topic Installing LinuxCNC On HP T610 Thin Client
Completed a test using the performance testing script. Thought this might be of interest.
LinuxCNC pc tests, version 20200930, started 17.04.2021 20:59:33
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General info:
Hewlett-Packard, HP t610 WW Thin Client
Bios version K30 v01.10, dated 10/26/2012
Chipset: Harddisk is non-rotational, ie. SSD
The amount of swap currently used is 0
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CPU related data:
model name : AMD G-T56N Processor
cpu cores : 2
stepping : 0
cache size : 512 KB
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RAM related data:
Maximum Capacity: 8 GB
Size: 2048 MB
Size: 2048 MB
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GPU related data:
product: Wrestler [Radeon HD 6320]
configuration: driver=radeon latency=0
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Parallel port related data:
number of parallel ports is 0
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Os and desktop related data:
PRETTY_NAME="Linux Mint 19.3"
Should the info below not match with your machine,
kindly post the output of pstree here, including a brief
desciption of your desktop environment, window manager and
display manager. Tia
https://forum.linuxcnc.org/18-computer/39370-script-for-automated-testing-of-computer-latency
Desktop environment : lightdm
Windowmanager : Xfwm4
Displaymanager : lightdm
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Kernel related data:
Kernel 4.19.0-16-rt-amd64
GRUB_CMDLINE_LINUX_DEFAULT="intel_idle.max_cstate=0 processor.max_cstate=1 idle=poll isolcpus=1"
Cpu idle driver: none
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Kernel modules data:
Check if pcspkr is loaded: [0;32mNo, which is good
I'm experimenting but its looking more and more like I am zeroing in on some settings that look promising on one of these units.
When completed I will post all data and repost the performance stats on the appropriate thread.
Cheers - J.
Using out of the box (no ethtool changes) you get a ping of 0.22ms to 0.28ms. I ran the machine for a couple of hours at this setting. Zero dropped packets and no latency excursion. I then got the tmax reading and put it into the calc on the PC tab of the 7i76e tool by JT. This showed a Packet Time of 55% and a Threshold of 70%. According to info on that tab you really want a Packet Time of <= 50%. Choices being to change the thread period or to improve network response.
I decided to try tuning the NIC. After some fiddling these settings done via ethtool dropped the ping times down to 0.13 to 0.18ms. Running the same checks seems to have a result of 45% and 70% respectively. I might still need to try some more tuning or raise the thread period a little bit.
I'm experimenting but its looking more and more like I am zeroing in on some settings that look promising on one of these units.
When completed I will post all data and repost the performance stats on the appropriate thread.
Cheers - J.
Attachments:
Last edit: 23 Apr 2021 12:05 by Joco. Reason: Adjusted "~43%" to 45% based on 1.5hrs of gcode running and stabilised tmax value.
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23 Apr 2021 20:58 #206889
by seuchato
Replied by seuchato on topic Installing LinuxCNC On HP T610 Thin Client
Hey Joco
What you are doing, will most probably help others, too. So: Big Fat Thanks!!!
Besides: Such tuning might be (might be, not is) possible under M$ too, but - - where to find?!
I just love linux and oss. Dot Period.
Greez
chris
What you are doing, will most probably help others, too. So: Big Fat Thanks!!!
Besides: Such tuning might be (might be, not is) possible under M$ too, but - - where to find?!
I just love linux and oss. Dot Period.
Greez
chris
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24 Apr 2021 06:49 - 24 Apr 2021 11:35 #206937
by Joco
Replied by Joco on topic Installing LinuxCNC On HP T610 Thin Client
Just a short note. Did some more testing with network stack and I think I have the 2 fundamental adjustments needed to get the best out of the NetLink BCM57781 Gigabit Ethernet. It's never going to be brilliant but I seem to have a pretty consistent 0.165secs ping. Which a lot better than the 0.220 that you get out of the box. Will include this all in my wrap up post. but these can be set in the network interfaces file.
Also stumbled across a comment relating to another board with onboard graphics where they found setting the graphics memory to 64MB made a difference. I had been running the default 512MB. Changing to 64MB seems toi have improved things a bit. This is evidenced in the hm2's read.tmax dropping by ~40k.
In the middle of ethernet stability testing at the moment. I am not trying for production grade here, I don't need day's on end connectivity.
Cheers - J.
Also stumbled across a comment relating to another board with onboard graphics where they found setting the graphics memory to 64MB made a difference. I had been running the default 512MB. Changing to 64MB seems toi have improved things a bit. This is evidenced in the hm2's read.tmax dropping by ~40k.
In the middle of ethernet stability testing at the moment. I am not trying for production grade here, I don't need day's on end connectivity.
Cheers - J.
Last edit: 24 Apr 2021 11:35 by Joco. Reason: fixed typo
The following user(s) said Thank You: seuchato
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24 Apr 2021 11:07 - 24 Apr 2021 11:09 #206943
by seuchato
Replied by seuchato on topic Installing LinuxCNC On HP T610 Thin Client
Last edit: 24 Apr 2021 11:09 by seuchato.
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24 Apr 2021 21:29 #206970
by Joco
Replied by Joco on topic Installing LinuxCNC On HP T610 Thin Client
Have you tried tests n the T620? I have a T630 which is the same generation apu and its latency is not flash. Isolating 3 cores, using idle=poll and a few other command line options, putting rtai process on its own core only gets me latency values of ~95us. Still within the upper limit i have seen mentioned as working (100 to 150us from memory).
So something about those newer apus that is not friendly. Mind you I have not tried all the tricks and variables yet but the starting position is nowhere near as good as the T610.
So something about those newer apus that is not friendly. Mind you I have not tried all the tricks and variables yet but the starting position is nowhere near as good as the T610.
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