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From: John Baldwin <jhb@FreeBSD.org>
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Date: Tue, 21 Jun 2005 15:39:25 -0400
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Cc: Emanuel Strobl <Emanuel.strobl@gmx.net>
Subject: Re: lapic@2k interrukts eating CPU cycles
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On Thursday 09 June 2005 08:23 am, Emanuel Strobl wrote:
> Hello,
>
> I recognized that doing a "make clean" in a simple ports takes minutes to
> finish, so I saw that "systat -vm" shows me about 80% system usage during
> that. But even if it's finished lapic keeps generating 2000 interrupts/sec
> and consuming 25% CPU usage when the machine is doning nothing.
> Any hints what I could do? I have never seen lapic before, I just did a
> fresh 6-snapshot (june) install and upgraded to yesterdays -current.
> Please find attached my kernel conf, although this time I use ULE the
> sluggish "make clean" behaviour was also with 4.2BSD (but I haven't looked
> after the CPU usage)
>
> Thanks,
>
> -Harry

I haven't seen the clock interrupts eat up 25% CPU on my systems.  Can you 
capture the output of 'top -S' when your system is idle?

-- 
John Baldwin <jhb@FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org