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Subject: Re: [PATCH] i386: Fix softirq accounting with 4K stacks
From: Mike Galbraith <efault@gmx.de>
To: =?ISO-8859-1?Q?Bj=F6rn?= Steinbrink <B.Steinbrink@gmx.de>
Cc: Arjan van de Ven <arjan@infradead.org>, linux-kernel@vger.kernel.org,
       danial_thom@yahoo.com, Linus Torvalds <torvalds@osdl.org>,
       Andrew Morton <akpm@osdl.org>
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Date: Mon, 26 Jun 2006 05:05:14 +0200
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On Mon, 2006-06-26 at 04:23 +0200, Mike Galbraith wrote:

> Something is certainly still b0rken.  I still get three different
> answers to the question "what is my cpu usage" depending on
> configuration.  With stock UP kernel with no IO-APIC, interrupt load is
> all hi.  With your patch and IO-APIC, it's all si.  SMP shows a mix of
> both.

I didn't say that quite right.

The third case for my box is XT-PIC and your patch.  Previously, top
showed the 10% interrupt load of a flood ping as all hi.  Now it's both
hi and si when using XT-PIC, but it's no longer the 10% that agreed with
the profile, it's  10% hi, but with an added ~7% si.

	-Mike