On Wed, Oct 13, 1999 at 09:26:08AM -0600, Godmar Back wrote:
>
> Actually, when the problem started occurring, I didn't run an application
[snip]
> > ----- Forwarded message from Godmar Back <[EMAIL PROTECTED]> -----
> > > The latest version of kaffe, when running kjc, manages to do this
> > > on my dual PII/350 with unix-jthreads running Linux 2.2.12:
> > >
> > > Oct 12 16:44:08 peerless kernel: stuck on TLB IPI wait (CPU#1)
> > > Oct 12 16:44:08 peerless last message repeated 111 times
> > > Oct 12 16:45:04 peerless last message repeated 100 times
The explanation so far has been, that it's a hardware bug that causes
a CPU to fall off the bus and therefore not respond to TLB IPI.
However, this started occuring on my box at home too. It started somewhere
in 2.2.x but I don't remember when (it's a long time ago, maybe 2.2.[23] or
so).
It bothers me that my system should have ``picked up'' a hardware error
as it got older. It's not something that I think is impossible at all,
but I think that it could also point to a kernel bug. Something that is
caused by something else changing.
I think the kernel-bug assumption might be strengthened if the fact
is that the TLB IPI timeout can be caused by some specific user-space
program.
It hasn't happened for me for some time now (running 2.2.7 and .12),
actually I don't think it has happened at all on .12. It used to happen
when I was doing heavy disk I/O (eg. RAID-to-RAID copy on four SCSI disks)
while also doing something CPU+memory intensive (like playing MPEG movies).
Because the problem no longer haunts me, I lost interest in it. But I'll
just see if I can trigger it again on .12. If I don't follow up, assume
I couldn't.
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