Hi Nicholas, all, Thank you very much for your answer and sorry for my delay...
6 janv. 2020 à 05:33 de nstee...@gmail.com: > While I'm very much a junior member of the team, I have noted similar > behaviour on a laptop as old as an X220 and wonder if it might be due to > Spectre mitigations. I have not noticed such log entries after > disabling hyperthreading. FYI, as someone who works with realtime audio > I've found that hyperthreading is detrimental to worst-case latency. > eg: after many hours trying to workaround troublesome unpredictable > latency spikes the solution to disable hyperthreading emerged as the > simplest solution. > I've just deactivated hyperthreading in my UEFI. Still the same warnings in journalctl :( At least, Internet resources indicate that's it's safer this way with HT deactivated (regarding MDS attacks) but I don't know (and really not anyone as it really depends on current CPU tasks) how my performances are impacted now... In your case, it seems to be a benefit but surely it's not always the case... Maybe I can just continue like this and restore HT if this is impossible to live with ;) >> >> > Have you > tried disabling CPU freq boost? When the ambient temperature is above > 27°C my X220 and X230 need to have boost disabled to avoid > overheating/throttling. > I've seen at least 2 ways to deactivate turbo boost: 1) echo "1" to /sys/devices/system/cpu/intel_pstate/no_turbo Visibly, as sysctl only works with /proc/sys (and not /sys), this needs to be set permanently via a systemd service. What do you think about this procedure: https://blog.christophersmart.com/2017/02/08/manage-intel-turbo-boost-with-systemd/? 2) modify MSR registers via wrmsr (https://askubuntu.com/a/619881). I don't know if there is persistance here... Do you use any of these? Something else? PS: My CPU is Intel(R) Core(TM) i7-8565U CPU @ 1.80GHz. PPS: Even if it works, I don't know if I'm not gonna lose some more performances... Actually my main questions are: i) Are those temperature warnings legitimate? I mean maybe those warnings have been wrongly triggered because probes are not accurate? I'm not speaking about HW failure (my laptop is brand new) but maybe I just don't have the right driver somewhere... Indeed, it would be too bad to decrease all my performances with HT/turbo-boost disabled (security apart) whereas the journalctl warnings are wrong initially... ;) PS: I have installed intel-microcode 3.20191115.2~deb10u1. Still the same issues. I don't know if it's an issue but microcode module is blacklisted in /etc/modprobe.d/intel-microcode-blacklist.conf (it seems to be a precaution regarding unsafe updates). ii) Is it risky to do nothing about these temperature warnings? I have no idea what EC means (Embedded Controller?) but you said EC eventually shutdowns the laptop if need be. I presume it's not really beneficial from the user point of view as the current tasks will be shutdowned and some work/data might be lost during the process. Thanks again & Best regards :) l0f4r0
