linux-kernel - Re: [Dumb question] 100k RTC interrupts/sec on SMP system: why?

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Message-Id: <20061109204145.56d02153.akpm@osdl.org>
Date:	Thu, 9 Nov 2006 20:41:45 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Paul P Komkoff Jr <i@...ngr.net>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Dumb question] 100k RTC interrupts/sec on SMP system: why?

On Thu, 9 Nov 2006 13:09:53 +0300
Paul P Komkoff Jr <i@...ngr.net> wrote:

> Hi.
> 
> I have a couple of old SMP systems (Dual P3 on Intel STL2 boards), on
> which I experience the following:
> procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
>  0  0      0 800752  45376 143064    0    0     0     8 96607   65  0 0 100  0  0
>  0  0      0 800752  45376 143064    0    0     0     0 96439   57  0 0 100  0  0
> 
> It's a completely idle system. Interrupts are coming from rtc.
> This is a stock fedora SMP kernel.
> 
> IIRC, some time ago (years) I've read that rtc can be used somehow in
> SMP but I don't remember the specifics. So, maybe you are familiar
> with this and can give out a quick answer - what this 100K
> interrupts/sec are about, and how to get rid of them (if possible).
> 

I guess we could start with the full dmesg output and the kernel version?
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