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Multicore performance --
I've recently come back to OpenBSD on a laptop, running it on a Panasonic Toughbook. I've noticed something that I'm not sure used to be this way a few years back (around 6.4 or so?):
When multiple processes try to run kernel locked syscalls, they spend _a lot_ of CPU time spinning on the kernel lock, quickly burning through the battery. I'm pretty sure it didn't use to be that way 5 years ago.
Did something change? Or am I misremembering?
Oct 07 · 2 months ago · 👍 norayr, magnusmww
🐐 drh3xx [mod] · Oct 08 at 11:50:
I can't think of anything specific but 7.6 has just dropped with a fair number of locks removed (mainly network stack but a little elsewhere too) so be interesting to see how it compares for you against 7.5. Most peoples issues with battery life and CPU temps were due to changes made a good few releases back now but Solene put together a nice little daemon to limit temps/clocks more dynamically obsdfreqd which helps alot.
if you are got back to the same laptop five years later, maybe the battery is not in good shape now?