interesting(?) data on network interrupt servicing

[Luigi Rizzo]

On Wed, Mar 22, 2006 at 10:18:44PM +0100, Poul-Henning Kamp wrote:
> 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 ?

so anything we can do in the kernel config to remove that ?
(i don't have here the config Paolo is using...)

cheers
luigi