On 11/01/2018 01:40, Steve Rutherford wrote: > That mode moves the x86 PIC, PIT, and IOAPIC up to userspace. I'm not > particularly familiar with OpenBSD so I can't claim to know how these > interact. If it's heavily reliant on the PIT for time, I could imagine > things going wrong (though that is just speculation on my part). The issue is with the local APIC timer. kernel_irqchip=off moves the LAPIC to userspace as well. It's a valid workaround, but disabling the preemption timer is better in my opinion. If there are bugs with that, I'd like to know. Sorry I've not followed up yet, you can guess what I've been busy with... Paolo
