Re: spurious 8259A interrupt?

From: Richard B. Johnson (
Date: Tue Oct 10 2000 - 07:48:29 EST

On Mon, 9 Oct 2000, Daniel Lange wrote:

> Periodically, I get the following error with the 2.4.0test9 kernel:
> spurious 8259A interrupt: IRQ7.

This will sometimes happen with the 8259A and really should not even
be logged. There is a default handler for all interrupts. If this
handler gets control from an unallocated interrupt, it writes this
message, ACKs the interrupt, then returns.

> Initializing CPU#0

You are using a SMP kernel on a `386 UP machine. That tends to make
these burps show up. It is harmless, though.

> Console: colour VGA+ 80x25
> Calibrating delay loop... 3.10 BogoMIPS

This shows something I don't understand. Either the counter wrapped,
a timer is mis-programmed, or the CPU clock speed is about 1.5 MHz.
You should look into this. Older kernels generally show the BogoMIPS
as being about equal to the CPU clock speed +/- 20%. Newer kernels
generally show it being about 2 times the clock speed +/- 20%.

> CPU: 386
> Checking 'hlt' instruction... OK.
> Checking for popad bug... Buggy.

I have one of these too.

Dick Johnson

Penguin : Linux version 2.2.17 on an i686 machine (801.18 BogoMips).

"Memory is like gasoline. You use it up when you are running. Of
course you get it all back when you reboot..."; Actual explanation
obtained from the Micro$oft help desk.

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