Nicklas, Check the hardware this way. use ip a to get the nic name for the mesa connection. Say enp0s2 Then sudo apt install ethtool -i enp0s2 will report driver and hardware. The r8169 is the default driver. Others are r8168-dkms and r8125-dkms Read the r8i68 driver notes. https://packages.debian.org/bookworm/r8168-dkms note to restore the original driver you need to apt purge the current driver (remove won't work...) I have one ethercat machine with 4 slaves on an Odroid H2+ with the 8125 NIC and its been OK. If installing the correct driver does not resolve it, try my kernel. It needs some testing! rough kernel build instructions are in the drive folder...
Good luck. This has taken me months to work out.... Rod Webster *1300 896 832* +61 435 765 611 Vehicle Modifications Network www.vehiclemods.net.au On Wed, 14 Dec 2022 at 20:48, Nicklas SB Karlsson <n...@nksb.eu> wrote: > ons 2022-12-14 klockan 05:15 +1000 skrev Rod Webster: > > Since the 5.10 kernel (eg Bullseye) and above, there has been an > > issue with > > excessive network latency with the Debian RT kernel and Realtek > > network > > interfaces with Mesa ethernet cards. When it bites, it causes a > > hm2_eth > > "error finishing read" and disables the mesa card. By avoiding > > realtek > > NIC's a whole swathe of small portable industrial PC's can no longer > > be > > used with linuxcnc. A resolution for this issue needs to be found > > before > > 2.9 rolls out or there will be massive support issues. > > > > > This issue is restricted to the debian environment. Installing a > > compiled > > kernel or running on a non-debian distribution solves the issue (I > > tried > > arch-linux) > > > > By default Debian uses the r8169 network driver for all realtek NIC's > > but > > provides a r8168-dkms driver which should solve the issue if > > installed if > > supported hardware is present. However, it appears that when this is > > installed, the network latency is rarely resolved. I suspect it is > > because > > of a buggy driver in Debian. Some people (PCW, JT et al) have > > resorted to > > compiling the kernel from pristine sources. > > > > I have finally been able to compile a 6.1 version of the PREEMPT_RT > > kernel > > and headers which I have stored in Google Drive > > Have had problem with ethercat message disappear then more than a few > cards are connected in series. Using lsmod I could see mdio_devres > r8169 so maybe this also explain the problem with Ethercat. > > Have however not yet checked. > > Nicklas Karlsson > > > > _______________________________________________ > Emc-developers mailing list > Emc-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-developers > _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
