I am profiling #GNOME Shell (MASSIVE thanks to #fedora enabling frame pointers for all packages in 38 making this possible) and noticed clock_gettime() taking up a huge chunk. Turns out I hit
https://bugzilla.kernel.org/show_bug.cgi?id=202525: many #AMD laptops are forced to use a very slow clock source (HPET instead of TSC). #Lenovo fixed it with a BIOS update for some laptops but not mine. Kernel param tsc=reliable results in big speedups (up to 30% in browser benchmarks) but unsure if it impacts stability :/

I like #Lenovo for how easily accessible #service manuals their laptops have. 👌🪛 💻

Funny is, the laptop I am fixing now has the usual warning for powering off the device and disconnecting the power cord and battery. Or here literally to remove the battery pack. But actually you have to disassamble half of the machine to disconnect the battery. And then the rest of the machine to remove the battery. There is even no option to disable battery in bios. 😀 ⚡🔋