Date: Wed, 22 Mar 2006 13:27:39 -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: <20060322132739.C42341@xorpc.icir.org> In-Reply-To: <11680.1143062324@critter.freebsd.dk>; from phk@phk.freebsd.dk on Wed, Mar 22, 2006 at 10:18:44PM %2B0100 References: <20060322131448.A42341@xorpc.icir.org> <11680.1143062324@critter.freebsd.dk>
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On Wed, Mar 22, 2006 at 10:18:44PM +0100, Poul-Henning Kamp wrote: > In message <20060322131448.A42341@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
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