panic: ipi_send: couldn't send ipi

[Kris Kennaway]

On Tue, Sep 28, 2004 at 11:34:51AM -0400, Ken Smith wrote:
> On Tue, Sep 28, 2004 at 12:16:20PM +0400, Andrew Belashov wrote:
> 
> > I have install this patch.
> > 
> > Hardware: Sun Ultra 60 Creator 3D, 2 x UltraSparc IIi @ 450 MHz, 1 GB 
> > memory.
> > 
> > OS: FreeBSD bel.localdomain 5.2-CURRENT FreeBSD 5.2-CURRENT #32:
> > Tue Sep 28 11:14:38 MSD 2004
> > bel at bel.localdomain:/usr/obj/usr/src/sys/SUNC3D  sparc64
> > 
> > Messages from console:
> > 
> > cpu_ipi_send: raised ipi_retries_max to 2000
> > cpu_ipi_send: raised ipi_retries_max to 3000
> 
> Thank you very much for testing this out.
> 
> Unless someone thinks this would be a problem I'll wait another couple
> of days and if nobody else has any further input I'll leave the existing
> code as-is but bump the max retries to 5000 for the 5.3 release.  I'm
> still curious about what the underlying problem is but it'll take some
> time to track down I think.  I did manage to find a machine to test
> this on late yesterday and some initial attempts at triggering the
> problem by generating a lot of disk I/O didn't seem to trigger it.
> 
> Your case seems to be a bit extreme - I'm wondering if it has something
> to do with the Creator 3D.  I don't think it is the only thing that can
> cause the problem to crop up but it might be something that makes the
> situation "worse".
> 
> Kris, was your problem machine one of the machines here?

I don't remember if any of those were SMP, but this was on phk's dual
u60.  I applied the patch in PR 66314, and while I haven't had a
repeat of the ipi panic, it did fall over with one of the other panics
I regularly see on this machine.  Also, jhb seemed to think there was
an underlying MI problem, and this patch would only delay the
occurence of the panic.

Kris
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