Date: Wed, 22 Mar 2006 13:14:48 -0800 From: Luigi Rizzo <rizzo@icir.org> To: Poul-Henning Kamp <phk@phk.freebsd.dk> Cc: current@freebsd.org Subject: Re: interesting(?) data on network interrupt servicing Message-ID: <20060322131448.A42341@xorpc.icir.org> In-Reply-To: <11503.1143060087@critter.freebsd.dk>; from phk@phk.freebsd.dk on Wed, Mar 22, 2006 at 09:41:27PM %2B0100 References: <20060322122906.A41691@xorpc.icir.org> <11503.1143060087@critter.freebsd.dk>
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On Wed, Mar 22, 2006 at 09:41:27PM +0100, Poul-Henning Kamp wrote: > In message <20060322122906.A41691@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
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