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PCW wrote:

Also what USB dongle?

I have a rtl8192cu based USB WIFI dongle on this test machine
and it seem to have no effect on latency when plugged/unplugged

Have you done the usual optimizations?

DKMS driver for RealTek Ethernet chips

Turn off IRQ coalescing on Intel Ethernet chips

in grub file isolcpus = last processor

pin Ethernet IRQ to last processor


 It means that the network message could not be compete in one cycle.

Actually it's worse than that, with default settings, it means 5 read requests in a row timed out
so usually means multi-ms latency...
 

I use the TP=Link TL-WN823N WiFi dongle.
The Ethernet chip is Intel on the PC.
I have not turned of IRQ coalescing (don't know how)
I did isolcpus but I am not sure that I did it correctly. It has 4 processors.
Pin Ethernet IRQ to last processor - I have not heard about that so no I have not done that either.

Seem like I have a lot of things that could contribute to the problem

I did do latency tests on the PC's and they all seemed to perform very well with no noticable peaks at all

Tommy I usually make use of nmtui or the network manager

Here it looks fine. Saw it in the first ethercat-conf.xml you attached.

There is no reason the PV mode should cause problems with other drives.
Check the output of "sudo dmesg" the last say 20 lines are of interest.

EDIT: SOLD!
_____________________________________
hey all, sorry to bring up an old thread, but I thought I might be able to offer something to help someone out there complete their own plasma build. 

I bought this Everlast 50s plasma off Rod some time ago to start my build at a time where I couldn't afford a Hypertherm. The plasma and all of Rod's information from this thread and others of his on the WWW allowed me to build my own CNC plasma on a budget with absolutely no prior experience in electronics. The CNC rapidly allowed me to upgrade to a bigger Hypertherm machine so now I would like to offer somebody else the opportunity to buy the same Everlast 50s for their own build.

A 45A Hypertherm is around $4,150 and a Unimig is around $1,549, so I think $750 plus shipping is a fair price considering it will come with a machine torch and consumables. I am located in Melbourne if pickup is preferred.

See link below for more details on the unit. PowerPlasma 50S.pdf

snowgoer540 wrote:

[ All internet traffuck appears to come from the same place because of how they appear to have the servers/vpn/whatever set up and YouTube then requires a sign in to view it.

Router, yes, that can also do that if the NAT (Network address translation) is ON, so all the PC's inside the network look as the same and only PC to the internet. Consequently the PC that youtube see's has a lot of users with different user names, hence the need for login to discern between users (and the ability to push tailored adds).
Thank you for reminding me, i forgot about that.

my1987toyota wrote:

 
and that could mean that the internet at work triggers something on YouTube that makes it
think that my computers at work are  bots of some kind. (strange that it didn't yesterday) 
 

FWIW this is how it is at my place of employment. All internet traffuck appears to come from the same place because of how they appear to have the servers/vpn/whatever set up and YouTube then requires a sign in to view it. Probably more specifically it’s likely because many of my coworkers appear to use YouTube to play music all day long. But to your point some days it will let me watch whatever I clicked on and some days it requires a sign in.

Some days I have to verify I’m not a bot just to do a simple google search.

No difference between the two here. Chasing "Net Zero" is pushing up prices everywhere, killing industries, especially anything to do with getting metals from ores. I'm almost starting the to those in charge don't actually want the population to build anything, except for housing that will built by imported Indians trained to be builders.......yeah that'll work. Yes they are targeting Indians nationals for this.
Short of houses, lets bring in more people to build houses...that will need more houses, bring some more people to bring in more houses....that will need more houses...rinse & repeat.

Those figures look pretty good, where did you get your kernel from or did you build it yourself.

Thank you very much for your suggestions.
Seems like there is indeed a lot of fine tuning or trial and error necessary.

Even with limits set to 99999, this happens; and on one system, I also got the probe error, although my „probe flipflop“ was held in reset.

So far, my first working setup >2.8.4 is the RPi/7c81 combo,
but with that working, I hope to find some time to learn more about your proposals for the Ethernet solution.


Thx,
AS

Kudos go out to all who made this possible:  
60000+ probes for now, during the last 24 hours, with an RPi5, 7c81 and the brand new 2.9.7.  
Zero issues, so far.    \o/

While probing, this thing now also runs a VNC server in the background,  
I am connected via VPN; it’s streaming music and also downloading a random  
10GB image file in a web browser.  

Pretty good latency too. Comparable to a decent RTAI setup, imho.  

Still some extra steps, as described here,  
  forum.linuxcnc.org/49-basic-configuratio...rol-is-choppy#332726  
and this "xset -r“ drives me crazy, bc I have to use the keyboard until I managed to get the handwheel working.

 

I consider it the fog of war. It gets harder and harder to differentiate between government and criminals.
I leave it to each individual to figure out the definition of each. 

Yeah I wasn't into EFI on bikes, until I got a 2000 M900......so easy to start

Well those that fell for he covid thing have only got themselves to blame. If more had of stood up.

But hey guess what the "conspiracy theorists" were right.

I made a diagram. Here's how it works. When power is applied to the set input, the coil turns on and remains on, but it does not glow red, but its additional contacts glow. Accordingly, powering the reset input turns it off. 

tommylight post=337548 userid=17274Nice, i am glad.
It is unreasonable not having several PC's these days, have work stuff separate from fun stuff and those separate from gaming stuff, etc etc, since the used PC's are very cheap and Linux is perfectly usable on them.

Hilariously in the early 2000's I didn't really care for computers I liked carburetors over EFI though over time that has changed. I have built
and installed multiple MegaSquirt EFI computers  mid 2000's I got my first Windows XP Laptop. It wasn't until mid 2010's that I started
looking into CNC and eventually multiple Linux installs on Desktops and Laptops though I still feel like a noob with mountains of
learning still ahead. 
  It is however very disheartening to see the direction the world has been pushed post Covid. 

 

The parts I makes typically requires double side machining and the Z thickness and flat over X-Y plane are two critical parameters.
I can measure my vice jaw flatness using Z probe over 4 corners as within 5~10um error. And there is tramming error that accounts <10um error over tip to tip in Y direction depending on the tool size. 
And here are my procedures to make the parts.
1. Create fixture on vice. Check flatness <10um variation corner to corner.
2. Prepare stock surfacing on vice on both sides
3. Does backside machining on vice
4. Flip and attach it to fixture on vice then front side machining
After this, typical error in thickness over corners are now in 100um range. I don't know where they are coming from and how to improve. My goal is to get to ~50um or less range.
Any advice would be welcomed.

Thanks