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cptaffe / plan9front

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*acpi= leads to slow reads in kvm #180

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
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)

Original issue reported on code.google.com by mischief@offblast.org on 16 Jul 2013 at 12:38

GoogleCodeExporter commented 9 years ago

Original comment by cinap_le...@felloff.net on 17 Jul 2013 at 7:46