Testers Needed for New RTAI Packages

New rtai packages to suit installs for my RTAI ISOs.

forum.linuxcnc.org/9-installing-linuxcnc...cnc?start=140#159323

The matching kernel packages are in the folder as well.

oddwick also mentioned it happens with a PS/2 keyboard, so this would rule out keyboard disconnecting/reconnecting issues as would happen with a USB keyboard ?

Could this be a kernel config issue ?

andypugh wrote:

I wonder if isolcpus would be worth a try, to run the realtime and user processes on separate cores?

I was wondering that as well. Could be worth a try.

sorry, had sick duck yesterday and wansn't able to get to the shop and do any testing.

andypugh wrote:

I wonder if isolcpus would be worth a try, to run the realtime and user processes on separate cores?

actually, i was running isolcups=1 still from when i switched from the rt kernel. when i got rid of isolcpus, actually that made the performance better. it sill stutters, but not nearly as pronounced, and ironically it gets worse the slower i jog.

checked logs, and there is nothing in there for the usb bus connects etc. that was my first thought. either it was disconnecting or buffer over/underruns which is why i switched to a ps2 keyboard, and that made no difference at all. in fact the entire system is just really sluggish even for and older machine with a realtime kernel. when i go to start lcnc, it will be probably a full 15-20 seconds before the window even comes up and probably 30 seconds after that before i get error window with the 'waiting for halcomp' error.

andypugh wrote:

You can specify a different resolution for boot in the grub config.

thank you! i tried that and it works better(ish). i ALWAYS forget to run update-grub after and cant figure out why it doesnt work. pebkac. now all i get is about 10 seconds of blank screen before desktop comes up. im guessing that is the splash flag? i dont ever really mess with grub and never took the time to learn that voodoo.

BeagleBrainz wrote:

New rtai packages to suit installs for my RTAI ISOs.

forum.linuxcnc.org/9-installing-linuxcnc...cnc?start=140#159323

The matching kernel packages are in the folder as well.

i installed this on an old laptop drive i had lying around to give it a test drive and it works flawlessly! for the install i just used etcher, which complained loudly about it being a 320gb drive, but otherwise it worked.

so i havent really had time to put it through its paces, but from what testing i did this was my conclusions. latency was about tripple (around 1800) than with stretch, but all in all, the system felt snappier, no keyboard lag, and i was able to jog around at 900ipm without a hiccup. and that was with wifi connected which is critical for my machines as all jobs are loaded from the network. actually i wonder how much of the latency is because of being on a spinner rather than a ssd. i like this enough i actually think i will put it on the main drive. seeing linuxcnc on mint after debian is as refreshing as somebody rolling down a window when you have a flatulent back seat passenger

so good on you. despite backwards toilets and seasons, now all your machines will work properly upside down!

Some areas are being smashed by storms, but on the plus side as of last week we’re basically bush fire free since they started in September. The biggest issue now is people stocking up hoarding and fighting over bog roll.
Anyways glad you are having success. Andy is the man that has done the hard work on the kernel.
A mechanical hdd can have some impact, wireless is another source. One thing to remember that the MATE desktop is a bit more resource hungry, there is a chance that using a XFCE desktop could lower that figure, but I’ve been lax in update XFCE images.
Once again many thanks for the feedback.