Subject: Re: stray interrupt 7
To: None <email@example.com>
From: Ronald Khoo <firstname.lastname@example.org>
Date: 11/05/1998 12:56:37
> This is always with a sysinst and tarballs built from -current. Every few
> times I get a good 'make build' of -current, I build a distribution and
> try installing it onto a second HD, to ensure that I could use it as a
> snapshot to restore my -current machine after a disaster.
> If I perform the exact same "installation test" with 1.3.2, I get no such
> messages about "stray interrupt 7".
> The only difference other than 1.3.2 bootfloppy+tarballs versus -current
> bootfloppy+tarballs, is that the installation media for 1.3.2 is ATAPI
> CD-ROM, and the media for -current is ATAPI ZIP 100.
There is a comment in /usr/src/sys/arch/i386/isa/isa_machdep.c
specifically about this subject: :-)
* Stray interrupts on irq 7 occur when an interrupt line is raised
* and then lowered before the CPU acknowledges it. This generally
* means either the device is screwed or something is cli'ing too
* long and it's timing out.
The comment says when it happens, but not why. It's always
worried me somewhat because I've seen quite a few IDE
disc drives exhibit this problem, and certainly from a long
time ago. Anyhow, it could be that.
My question is, is it really a problem ? :-) Can't easily
tell because the counter is static :-P and I've never
had an opportunity to un-static it on one of those machines
to see if the number of strays is anything to worry about.