repro steps:

boot 9front with *acpi= ratrace any program watch the Preads...

cinap_lenrek said:

16:10 < mischief> i wonder why enabling *acpi= makes reads take so long 16:11 < cinap_lenrek> wrong interrupts 16:11 < mischief> huh? 16:12 < cinap_lenrek> the difference between *acpi= and *acpi=0 is that with *acpi= we use acpi to extract the pci irq to apic mapping 16:13 < cinap_lenrek> with *acpi=0, we just expose the acpi tables to userspace (used by scram)