Source of NMI greatly depends on your hardware brand, since NMI is wired
differently on many motherboards. In my Intel server box, for example,
NMI can be caused by internal "intstrumentation", or diagnostics (like
when some fan RPM drops below certain level, or temperature raises). It
also has NMI pin-hole button on its panel, so I can issue NMI manually,
although I don't know what for. Look in motherboard manual for info how
NMI is wired.
Haim
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]] On Behalf Of Nadav Har'El
> Sent: Sunday, June 17, 2001 6:00 PM
> To: Cedar Cox
> Cc: [EMAIL PROTECTED]
> Subject: Re: NMI?
>
>
> On Sun, Jun 17, 2001, Cedar Cox wrote about "NMI?":
> >
> > Mar 15 03:36:06 nanu kernel: Uhhuh. NMI received. Dazed and
> confused, but
> > trying to continue
> > Mar 15 03:36:06 nanu kernel: You probably have a hardware
> problem with
> > your RAM chips
> >
> > As you can see, I got this in my syslog quite a while ago..
> The server's
> > been running great and this is the only time I've ever
> gotten a message
> > like this. Can anyone shed some light on this? What is NMI?
> >
> > -Cedar
>
> NMI = "NonMaskable Interrupt". I have no idea what can be causing this
> (maybe somebody else here knows?) but the kernel's hunch
> might be correct :(
>
> A quick search on Google for "nonmaskable interrupt" provided with the
> following page:
> http://www.pcguide.com/ref/mbsys/res/irq/funcNMI-c.html
>
> "All of the regular interrupts that we normally use and
> refer to by
> number are called maskable interrupts. The processor is
> able to mask,
> or temporarily ignore, any interrupt if it needs to, in order to
> finish something else that it is doing. In addition,
> however, the PC
> has a non-maskable interrupt (NMI) that can be used for serious
> conditions that demand the processor's immediate
> attention. The NMI
> cannot be ignored by the system unless it is shut off
> specifically.
>
> When an NMI signal is received, the processor immediately drops
> whatever it was doing and attends to it. As you can
> imagine, this
> could cause havoc if used improperly. In fact, the NMI signal is
> normally used only for critical problem situations,
> such as serious
> hardware errors. The most common use of NMI is to
> signal a parity
> error from the memory subsystem. This error must be dealt with
> immediately to prevent possible data corruption."
>
>
> --
> Nadav Har'El | Sunday, Jun 17
> 2001, 26 Sivan 5761
> [EMAIL PROTECTED]
> |-----------------------------------------
> Phone: +972-53-245868, ICQ 13349191 |You have the right to
> remain silent.
> http://nadav.harel.org.il |Anything you say will be
> used against you.
>
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