Re: 8.1-RC2 MCE caused by some LAPIC/clock changes? (was: 8.1-RC2 -

On 13.07.2010, at 16:02, Markus Gebert wrote:

> Unfortunately, I have not been able to get anything useful out the svn =
commit logs, which could explain this. Maybe someone else has an idea =
what could have changed between 7 and 8 to break it, and again between 8 =
and CURRENT to magically fix it again.

I tracked this down further. I couldn't easily downgrade my 8.1 =
installation to see when the problem was introduced because the zpool =
version used is 14. So I tried to figure out, when the problem was =
solved in CURRENT.

I started with the first possible revision that can boot off my v14 pool =
(r201143, Dec 28, zfs v14 commit). With this revision, I was able to =
trigger the MCE.

Then I took some later revision (rev206010, Apr 1, chosen randomly), and =
I couldn't reproduce the problem. I started narrowing the revisions down =
until I found out, that while on r202386 I'm still able to trigger the =
MCE, r202387 seems to solve the problem on CURRENT:

http://svn.freebsd.org/viewvc/base?view=3Drevision&revision=3D202387

Since John Baldwin mentioned this problem could be timing related, it =
seems reasonable, that a clock-related change could be fix it. But this =
commit seems to have been MFC'd to 8-STABLE and 8.1 (at least as far as =
I can tell) along with some other changes to amd64 specific code. I =
thought that maybe these other changes that have been MFC'd could have =
reintroduced the problem later on, but so far I could not reproduce the =
problem with newer CURRENT revisions. So, I actually nailed this one =
done to a single commit on CURRENT, but still cannot tell what the =
actual difference is compared to 8-STABLE/8.1.

Any ideas how to proceed?


Markus=
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