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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 12:29:06 PST."
	<20060322122906.A41691@xorpc.icir.org> 
Date: Wed, 22 Mar 2006 21:41:27 +0100
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Cc: current@freebsd.org
Subject: Re: interesting(?) data on network interrupt servicing 
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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.

-- 
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.