On 02.11.2020 04:36, Gilberto Nunes wrote: > Hi there > > I am in trouble when using newer kernels than 5.4.x regarding Realtek NIC > r8169 > > Kernel 5.9.2-050902-lowlatency (from > https://kernel.ubuntu.com/~kernel-ppa/mainline/ and also compiled from > kernel.org) > > Generic FE-GE Realtek PHY r8169-101:00: Downshift occurred from > negotiated speed 1Gbps to actual speed 100Mbps, check cabling! > r8169 0000:01:00.1 enp1s0f1: Link is Up - 100Mbps/Full (downshifted) - > flow control rx/tx > > Kernel 5.4.73-050473-lowlatency (from > https://kernel.ubuntu.com/~kernel-ppa/mainline/) > > IPv6: ADDRCONF(NETDEV_CHANGE): enp1s0f1: link becomes ready > r8169 0000:01:00.1 enp1s0f1: Link is Up - 1Gbps/Full - flow control rx/tx > > Cable is ok! I double check it.... > The downshift hint didn't exist yet in 5.4. Can you check what the actual link speed is under 5.4 (e.g. using iperf3).
Under 5.9: Does the downshift happen directly when the link is initially established, or after some time? If link speed actually differs, then please: - provide full dmesg log - ideally do a git bisect to find the offending commit (as issue most likely is chip version / system dependent) > > > > > --- > Gilberto Nunes Ferreira >
