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To: Luigi Rizzo <rizzo@icir.org>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
In-Reply-To: Your message of "Wed, 22 Mar 2006 13:14:48 PST."
	<20060322131448.A42341@xorpc.icir.org> 
Date: Wed, 22 Mar 2006 22:18:44 +0100
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Sender: phk@critter.freebsd.dk
Cc: current@freebsd.org
Subject: Re: interesting(?) data on network interrupt servicing 
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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 ?

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.