interesting(?) data on network interrupt servicing

[Luigi Rizzo]

On Wed, Mar 22, 2006 at 09:41:27PM +0100, Poul-Henning Kamp wrote:
> In message <20060322122906.A41691 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 ?

	cheers
	luigi