On Monday, 7 March 2022 03:00:41 EST John Dammeyer wrote: > Thanks Gene, > Didn't even think to look there. Was logged in remotely in the pi user > folder and don't have access to the /boot. (Just haven't given > permission). Went to the system and found it in /boot just as you > said. > > console=serial0,115200 console=tty1 root=PARTUUID=f1b66b19-02 > rootfstype=ext4 elevator=deadline fsck.repair=yes isolcpus=3 idle=poll > rootwait quiet splash plymouth.ignore-serial-consoles > > This site talks about > https://www.linuxtopia.org/online_books/linux_kernel/kernel_configurati > on/re46.html > > isolcpus=1,2,3 > makes no difference. The latency error still shows up.
Yup, the arms are a different beast. I get a very consisten 12 u-secs here as long as FF isn't running, its an IRQ pig. > Here's some info on the ForceTurbo > https://forum.linuxcnc.org/27-driver-boards/42413-rpi4-7i96-improving-p > ing-times > > But this implies the stock RPi4 will _not_ run LCNC without heatsin+fan > plus boosting above stock. True, but an old 12 volt video card fan, re-oiled and running on 5 volts from the same 5A supply running the pi, toss the wall wart, its not big enough and it will crash, a half inch from those stick on heat sinks is all the coolant mine has ever needed, and I don't think I'm boosting the pi4's clock. Some of my hand controls to jog it, since a human is pretty slow, are running on a 200hz thread to reduce the load on the 1 kilohertz servo-thread, but I have experimentally run the servo-thread at 4 kilohertz w/o any problems for a couple weeks. Basically, the rpi3 has its tongue dragging on the floor doing this, very little left when LCNC is running, but the rpi4 has enough extra speed that even 4khz isn't a problem. And 200hz is plenty fast enough for the hand controls. > > John > > > -----Original Message----- > > From: gene heskett [mailto:ghesk...@shentel.net] > > Sent: March-06-22 9:57 PM > > To: Enhanced Machine Controller (EMC) > > Subject: Re: [Emc-users] Pi4 with LinuxCNC and MESA 7i92H > > > > On Sunday, 6 March 2022 23:20:41 EST John Dammeyer wrote: > > > Hi Sam, > > > I cannot find the equivalent of cmdline.txt on my Pi4 LinuxCNC > > > system. > > > This is the file that has the Idle=poll etc. Does this mean it's > > > not > > > part of the default LinuxCNC implementation for a Pi4? > > > > > > So where does it go and how is it accessed? Is there a how to > > > document for this? Thanks > > > John > > > > You probably didn't look in the right place John, if thats a raspios > > install, aka raspian back in buster days, its in the /boot partition. [...] Take care and stay well John. Cheers, Gene Heskett. -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
