I rebooted with the added max_cstate-parameter, and speeds are fine, no errors in ethtool I installed the vanilla 5.10.42 kernel, rebooted without the kernel parameter and the errors persisted I rebooted the same kernel without the parameter and the errors returned After I did this clean boot, I booted the updated ubuntu kernel 5.8.0-55 with the max_cstate parameter and speeds where fine again I booted a live stick (Ubuntu 20.04.2.0), using ubuntu kernel 5.8.0-43 and speeds seem to be fine without any kernel parameter I have removed all the newly installed packages, removed every module-setting added from/for lm-sensors or thinkfan and re-tested the kernels - the parameter had no effect anymore. All I did was to install everything I needed to build the vanilla kernel and some sensor stuff for fan-control. I did re-run the speed-tests with various kernels I already tested and for some reason even when booting with intel_idle.max_cstate=1, my networking was broken with ethtool reporting errors. I'll attach a sample dmesg output from one of the test runs.ġ) The issue happens when the CPU reaches deeper power saving state, likely PC10.Ģ) Temporarily increase CPU usage via cpu_latency_qos_add_request() to disable C-State doesn't help. I was not able to spot any conspicuous log messages (dmesg, syslog etc.) until now. When booting the same kernel(s) with "intel_idle.max_cstate=1", everything works as expected. ethtool reports increasing errors at rx_errors and rx_crc_errors. When booting without any special kernel parameters, receive speeds are very poor up to a complete hang. So far I tested kernel versions 5.8, 5.10 and 5.11, mainly on ubuntu, 5.11 on fedora, so this does not seem to be distribution specific. I did file an upstream distribution bug at but was requested to file a kernel bug against this. I encountered very poor receive speeds using the e1000e driver for wired ethernet connection via I219-V internal network card. Dmesg from one of the test installs using 5.10er kernel on ubuntu 20.04
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