linux-kernel - Re: [PATCH] i386: disable local apic timer via command line or dmi quirk

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Date:	Tue, 27 Mar 2007 23:38:26 -0400
From:	Len Brown <lenb@...nel.org>
To:	tglx@...utronix.de
Cc:	Stefan Prechtel <stefan.prechtel@...glemail.com>,
	Andi Kleen <ak@...e.de>,
	Grzegorz Chwesewicz <grzegorz.chwesewicz@...lan.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu,
	john stultz <johnstul@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Adrian Bunk <bunk@...sta.de>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH] i386: disable local apic timer via command line or dmi quirk

On Tuesday 27 March 2007 23:28, Len Brown wrote:
> Thomas,
> 
> Is this failure specific to NO_HZ, and that is why the "nolapic_timer" fix is i386 only?
> I'm running 2.6.21-rc5 an nx6325 here in 64-bit mode and I don't see the dramatic
> boot failure described earlier in this thread.
> 
> However, I have observed that when running on battery,
> the LOC falls behind the irq0 timer to the tune of about
> 2 interrupt/minute.  eg. when i booted my machine, LOC was
> behind irq0 by 50, and now about a 20 minutes later it is behind
> irq0 by 99.  However, the LOC for each processor remain at
> a constant offset with respect to each other.
> 
> I do not see these this drift when running on AC.

Correction.
I double-checked and the same drift is present between irq0
and LOC when on AC:

lenb@...325:/tmp/sut> uname -a; cat /proc/interrupts; sleep 100; cat /proc/interrupts
Linux nx6325 2.6.21-rc5 #37 SMP Tue Mar 27 22:26:00 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux
           CPU0       CPU1
  0:    1000442          0    <NULL>-edge      timer
  1:        724          0   IO-APIC-edge      i8042
  8:          0          0   IO-APIC-edge      rtc
 12:      36299          0   IO-APIC-edge      i8042
 14:      33661          0   IO-APIC-edge      ide0
 16:      20676          0   IO-APIC-fasteoi   libata
 19:         21          0   IO-APIC-fasteoi   ehci_hcd:usb1, ohci_hcd:usb2, ohci_hcd:usb3
 20:          1          0   IO-APIC-fasteoi   ohci1394
 21:       9388          0   IO-APIC-fasteoi   acpi
 23:      43794          0   IO-APIC-fasteoi   eth0
NMI:          0          0
LOC:    1000271    1000247
ERR:          0
           CPU0       CPU1
  0:    1025442          0    <NULL>-edge      timer
  1:        724          0   IO-APIC-edge      i8042
  8:          0          0   IO-APIC-edge      rtc
 12:      39539          0   IO-APIC-edge      i8042
 14:      34506          0   IO-APIC-edge      ide0
 16:      22172          0   IO-APIC-fasteoi   libata
 19:         21          0   IO-APIC-fasteoi   ehci_hcd:usb1, ohci_hcd:usb2, ohci_hcd:usb3
 20:          1          0   IO-APIC-fasteoi   ohci1394
 21:       9630          0   IO-APIC-fasteoi   acpi
 23:      44826          0   IO-APIC-fasteoi   eth0
NMI:          0          0
LOC:    1025269    1025245
ERR:          0
lenb@...325:/tmp/sut> bc -l
bc 1.06
Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.
For details type `warranty'.
1025442-1000442
25000
1025269-1000271
24998
lenb@...325:/tmp/sut> cat /proc/acpi/ac_adapter/C1BD/state
state:                   on-line

-Len

> Yes, the system exports just C1 in both cases.
> 
> Other oddities is the IRQ name on irq0 is garbled:
> 
> lenb@...325:~> uname -a; cat /proc/interrupts; sleep 100; cat /proc/interrupts
> Linux nx6325 2.6.21-rc5 #37 SMP Tue Mar 27 22:26:00 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux
>            CPU0       CPU1
>   0:     723812          0    <NULL>-edge      timer
>   1:        716          0   IO-APIC-edge      i8042
>   8:          0          0   IO-APIC-edge      rtc
>  12:      30719          0   IO-APIC-edge      i8042
>  14:      24318          0   IO-APIC-edge      ide0
>  16:      18316          0   IO-APIC-fasteoi   libata
>  19:         21          0   IO-APIC-fasteoi   ehci_hcd:usb1, ohci_hcd:usb2, ohci_hcd:usb3
>  20:          1          0   IO-APIC-fasteoi   ohci1394
>  21:       6736          0   IO-APIC-fasteoi   acpi
>  23:      30358          0   IO-APIC-fasteoi   eth0
> NMI:          0          0
> LOC:     723675     723651
> ERR:          0
>            CPU0       CPU1
>   0:     748812          0    <NULL>-edge      timer
>   1:        716          0   IO-APIC-edge      i8042
>   8:          0          0   IO-APIC-edge      rtc
>  12:      30719          0   IO-APIC-edge      i8042
>  14:      25164          0   IO-APIC-edge      ide0
>  16:      18361          0   IO-APIC-fasteoi   libata
>  19:         21          0   IO-APIC-fasteoi   ehci_hcd:usb1, ohci_hcd:usb2, ohci_hcd:usb3
>  20:          1          0   IO-APIC-fasteoi   ohci1394
>  21:       6960          0   IO-APIC-fasteoi   acpi
>  23:      31385          0   IO-APIC-fasteoi   eth0
> NMI:          0          0
> LOC:     748673     748649
> ERR:          0
> lenb@...325:~> bc -l
> bc 1.06
> Copyright 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc.
> This is free software with ABSOLUTELY NO WARRANTY.
> For details type `warranty'.
> 748812-723812
> 25000
> 748673-723675
> 24998
> 723812-723675
> 137
> 748812-748673
> 139
> lenb@...325:~> 
> 
> Further, in dmesg:
> ATI board detected. Disabling timer routing over 8254.
> 
> ..MP-BIOS bug: 8254 timer not connected to IO-APIC
> 
> -Len
> 
> 
> 
-
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