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
