Re: interesting(?) data on network interrupt servicing

In message <20060322131448.A42341_at_xorpc.icir.org>, Luigi Rizzo writes:

>> >    if (thread)
>> >	isrc->is_pic->pic_disable_source(isrc, PIC_EOI);
>> >
>> >I have no idea, though, why the other pic_disable_source()
>> >is so expensive. The 4-5k TSC ticks are approx 3us
>> >
>> >Any clues ?
>> 
>> ISA bus access.
>
>yeah but this is a modern laptop with an apic,
>not an 8259... i don't think it has any ISA bus unless there is
>some strange emulation going on ?

There is, how else would it boot MS-DOS ?

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