15.06.2021 16:05, Daniel Lezcano пишет: > On 15/06/2021 14:53, Dmitry Osipenko wrote: >> 13.06.2021 21:19, Daniel Lezcano пишет: >>> On 13/06/2021 02:25, Dmitry Osipenko wrote: >>> >>> [ ... ] >>> >>>>> You should set the trip points close to the functioning boundary >>>>> temperature given in the hardware specification whatever the resulting >>>>> heating effect is on the device. >>>>> >>>>> The thermal zone is there to protect the silicon and the system from a >>>>> wild reboot. >>>>> >>>>> If the Nexus 7 is too hot after the changes, then you may act on the >>>>> sources of the heat. For instance, set the the highest OPP to turbo or >>>>> remove it, or, if there is one, change the thermal daemon to reduce the >>>>> overall power consumption. >>>>> In case you are interested in: https://lwn.net/Articles/839318/ >>>> >>>> The DTPM is a very interesting approach. For now Tegra still misses some >>>> basics in mainline kernel which have a higher priority, so I think it >>>> should be good enough to perform the in-kernel thermal management for >>>> the starter. We may consider a more complex solutions later on if will >>>> be necessary. >>>> >>>> What I'm currently thinking to do is: >>>> >>>> 1. Set up the trips of SoC/CPU core thermal zones in accordance to the >>>> silicon limits. >>>> >>>> 2. Set up the skin trips in accordance to the device limits. >>>> >>>> The breached skin trips will cause a mild throttling, while the SoC/CPU >>>> trips will be allowed to cause the severe throttling. Does this sound >>>> good to you? >>> >>> The skin temperature must be managed from userspace. The kernel is >>> unable to do a smart thermal management given different thermal zones >>> but if the goal is to go forward and prevent the tablet to be hot >>> temporarily until the other hardware support is there, I think it is >>> acceptable. >> >> The current goal is to get maximum from what we already have, thank you. > > maximum of performance or maximum of mitigation ? The best balance of both. Maximum performance + no risk of damaging hardware + pleasant body temperature from a user perspective.
