linux-kernel - Re: [QUESTION] Rather high /proc/interrupts ERR count

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Date:	Mon, 29 Dec 2008 11:17:16 +0000
From:	Nick Warne <nick@...sn.org>
To:	Len Brown <lenb@...nel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [QUESTION] Rather high /proc/interrupts ERR count

On Sun, 28 Dec 2008 22:39:32 -0500 (EST)
Len Brown <lenb@...nel.org> wrote:

> 
> On Fri, 26 Dec 2008, Nick Warne wrote:

> > ERR:     354616
> > MIS:          0
> 
> 21189+333431 = 354620
> 
> So virtually all of the ERR's are from IRQ7,
> which is how  the PIC identifies interrupts
> when it has no idea of the real source.
> 
> The PIC actually doesn't have a concept of directing
> interrupts to non CPU0, and the fact that CPU1
> on this box thinks it receives some of the interrupts
> is in the undocumented area known as "implementation specific"
> or maybe stated as "don't do this at home".
> 
> So the better thing to focus on would be how to get rid of
> "noapic" on your cmdline and get the system into IOAPIC
> mode, as it was designed to be.

Thanks Len - you explained it to me perfectly, and as suggested:

           CPU0       CPU1       
  0:        121        494   IO-APIC-edge      timer
  1:         17      20796   IO-APIC-edge      i8042
  6:          0          3   IO-APIC-edge      floppy
  7:          1          0   IO-APIC-edge    
  8:          0          1   IO-APIC-edge      rtc0
  9:          0          0   IO-APIC-fasteoi   acpi
 14:          2        139   IO-APIC-edge      pata_amd
 15:          0          0   IO-APIC-edge      pata_amd
 16:         86      85163   IO-APIC-fasteoi   nvidia
 20:          0          4   IO-APIC-fasteoi   ehci_hcd:usb1
 21:          0          0   IO-APIC-fasteoi   sata_nv
 22:        570     404175   IO-APIC-fasteoi   sata_nv, Intel ICH
 23:       1236    8996739   IO-APIC-fasteoi   ohci_hcd:usb2, eth0
NMI:          0          0   Non-maskable interrupts
LOC:    4497869    5381066   Local timer interrupts
RES:     999249     570052   Rescheduling interrupts
CAL:     105254     112444   Function call interrupts
TLB:      14640       6594   TLB shootdowns
TRM:          0          0   Thermal event interrupts
THR:          0          0   Threshold APIC interrupts
SPU:          0          0   Spurious interrupts
ERR:          1
MIS:          0

Now appears fine (I get one ERR at boot, for some reason).

Thanks for the information.

Nick
-- 
Free Software Foundation Associate Member 5508
http://linicks.net/
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