> > mounted. Decided to use the "i8042: PNP: No PS/2 controller found." > > line instead for a simple test (just check the kernel log timestamps, > > three runs each). The ACPI initialization is already done at that > > point, so it should be useful nevertheless. Here we go: > > > > Without acpi: > > 0.277710 > > 0.278852 > > 0.279520 > > > > With acpi: > > 0.283917 > > 0.284262 > > 0.284836 > I wonder what would be difference with hw-reduced acpi
The kernel does a bunch of reads+writes at boot (roughly 20-30), mostly timer ports, so probably while initializing the pm_timer clocksource. Then it stops talking to the acpi hardware, preferring kvmclock clocksouce I guess. So I expect hw-reduced acpi wouldn't make much of a difference. Actually trying that isn't that high on my priority list. There is bigger fish to fry, untangling the hw/i386/acpi-build.c monster for starters, so building with ACPI=y + PCI=n works ... cheers, Gerd
