I have been using one of those heatsink cases with passive cooling.. On Mon, Mar 7, 2022 at 9:31 AM Peter C. Wallace <[email protected]> wrote:
> On Mon, 7 Mar 2022, John Dammeyer wrote: > > > Date: Mon, 7 Mar 2022 00:00:41 -0800 > > From: John Dammeyer <[email protected]> > > Reply-To: "Enhanced Machine Controller (EMC)" > > <[email protected]> > > To: "'Enhanced Machine Controller (EMC)'" < > [email protected]> > > Subject: Re: [Emc-users] Pi4 with LinuxCNC and MESA 7i92H > > > > 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_configuration/re46.html > > > > isolcpus=1,2,3 > > makes no difference. The latency error still shows up. > > > > Here's some info on the ForceTurbo > > > https://forum.linuxcnc.org/27-driver-boards/42413-rpi4-7i96-improving-ping-times > > > > But this implies the stock RPi4 will _not_ run LCNC without heatsin+fan > plus boosting above stock. > > > > John > > > > Force Turbo or the equivalent is needed for almost any real time operation, > regardless of CPU type. Dynamic changing of CPU speeds almost always > involves > very long delays (sometimes many ms) so all such schemes must be disabled > (SpeedStep, C1 states > 1, cool and quiet etc etc) > > I have a RPI4 thats been running LinuxCNC for a couple of years without a > fan > and without latency errors (but with a small stick-in heat sink) Without a > heat > sink, the RPI4's CPU speed will always be throttled when it gets too hot. > > > > Peter Wallace > Mesa Electronivs > > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
