NMI Error

NMI Error

[Savio Dias]

Hello,

I have a 1U assembled rack server with the following config :
P-IV / 2.4 Ghz / 1GB RAM / 80 x 2 GB SATA HDD 
RedHat Linux 9 installed.

I have been getting the following error since the last few days and am
unable to find out the reason for the same, and also how to rectify
the same.
I have an identical machine with the same configuration and the same
OS, but do not get the same error on that.

Would appreciate your help, i got your reference from the /proc/interrupts file.

Thanks in advance.

Warm Regards,

Savio Dias

Fwd: NMI Error

[Savio Dias]

Oops i did not mention the error ....this is the error 

Uhhuh. NMI received for unknown reason 30 on CPU 0.
Dazed and confused, but trying to continue
Do you have a strange power saving mode enabled?

Please let me know what i do to recify this error

Regards,

Savio Dias

---------- Forwarded message ----------
From: Savio Dias <saviodias@gmail.com>
Date: Thu, 6 Jan 2005 14:50:54 +0530
Subject: NMI Error
To: linux-smp@vger.kernel.org, mingo@redhat.com


Hello,

I have a 1U assembled rack server with the following config :
P-IV / 2.4 Ghz / 1GB RAM / 80 x 2 GB SATA HDD
RedHat Linux 9 installed.

I have been getting the following error since the last few days and am
unable to find out the reason for the same, and also how to rectify
the same.
I have an identical machine with the same configuration and the same
OS, but do not get the same error on that.

Would appreciate your help, i got your reference from the /proc/interrupts file.

Thanks in advance.

Warm Regards,

Savio Dias

Re: NMI error

[Thomas HERAULT]

On Wed, 25 Jul 2001 04:38:51 -0700 (PDT)
Kannan Soundarapandian <wskannan@yahoo.com> wrote:

> Hello,
> 
> I am a grad student at the Oregon State univ. I have
> the same problem as you. I have a dual p3 1gig
> processor system with the Asus CUR-DLS motherboard
> (which uses the serverworks LE chipset), and 512 mb 
> Registered samsung RAm as one module. I am also using
> a quantum atlas10k2scsi hdd with an on motherboard
> symbios controller.
> 
> I get the following error continuously.. after which
> the system dies! I'm using redhat7.1.
> 
> Can u please help me fix the problem??
> 
> Uhhuh. NMI received. Dazed and confused, but trying to
> continue 
> Do you have a strange power saving mode enabled?
> 
> Please help. Thank you very much
> 
> Kannan
> 
> 
> =====
> --
> Kannan Soundarapandian,
> OSU, Corvallis.
> 
>

Hi.
I *almost* "solved" this problem :
Since linux-2.4.2-ac18, by default nmi_watchdog is disabled.
If you re-enable it with nmi_watchdog=1 as kernel boot parameter,
the symptom disapear.
But it is only a work around which works : the fact is that in
arch/i386/kernel/traps.c, there is a test,
  if (nmi_watchdog)
    {
        nmi_watchdog_tick(regs);
        return;
    }
Thus, our NMIs are catched an treated like watchdog NMIs,
but even if you disable nmi_watchdog (like it is by default),
these NMIs occure on my (our ?) CPUs (approximatively 300 interruption / second)
and produces these annoying error messages.

On other multi-processors motherboards I know, when you set
nmi_watchdog=0, the cat /proc/interrupts says that there is
0 NMI on every CPU ; on mine, I still have 300 NMI / sec.

For those of the lkm which are interested in this problem,
my motherboard is a 694D Pro (MS-6321) from MSI, with
a VIA VT82C694X chipset and an Apollo Pro133A north bridge,
featuring 2 Pentium III at 800 Mhz. Every kernel I tested
(2.2.x included) had the same problem.
The reasons of the interruptions are (2d then 3d)*

Hope that help and that someone could help us find what
produces these interruptions.