On Sat, 2 Jun 2007, Tear wrote:
>
> I own a Dell OptiPlex GX240 which, when ACPI is disabled
> but IO-APIC is enabled, shows very slow USB performance.
> I thought that this could be related to IO-APIC and
> tried to boot with "noapic" appended to the kernel
> command line. This way the USB transfer speed returned
> to normal values.
Well, it's almost certainly not the IO-APIC per se.
It's more likely to be some irq routing issue, where ACPI fixes up
something. Do you have diffs of 'dmesg' with and without ACPI?
Linus
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