System clock died on e420r

[Kris Kennaway]

On Mon, Feb 14, 2005 at 03:06:35PM -0800, Kris Kennaway wrote:
> On Mon, Feb 14, 2005 at 11:14:51PM +0100, Poul-Henning Kamp wrote:
> > 
> > If hardclock dies, timecounters (like much else) suffers.
> 
> Surely, so why is it happening and how can it be fixed? :)
> 
> jhb suspected there might be unserialized access to the time counter
> on sparc64.  This doesn't explain the i386 problems, but they could be
> related to other recent commits.  Note that the only problems I've
> seen so far are on SMP machines.

It happened again on a quad-cpu e450 machine after updating it from
RELENG_5 from December to top of RELENG_5.  What sparc64-related
changes have recently been merged that could cause this?

Kris
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