In article <4ac0f173.10...@cs.rice.edu> you write:
>Daniel O'Connor wrote:
>> On Sun, 27 Sep 2009, Alan Cox wrote:
>>
>>> Ok, now I can explain what is happening. The kernel is using 1GB
>>> pages to implement the direct map. Unfortunately, pmap_extract()
>>> doesn't know how to handle a 1GB page mapping. pmap_kextract() only
>>> works by an "accident" of its different implementation. In other
>>> words, it should not be relied upon to work either.
>>>
>>> Please revert whatever patch John gave you and try the attached
>>> patch. It simply disables the use of 1GB page mapping by the direct
>>> map.
>>>
>>
>> Your patch fixes (works around?) the problem.
>>
>
>Thanks. I've committed the patch.
>
>Yes, it's a work around. Fortunately(?), on my test machine, I don't
>see any measurable effect from disabling the use of 1GB pages by the
>direct map.
Btw I had reported the same issue back in June already,
http://lists.freebsd.org/pipermail/freebsd-current/2009-June/008709.html
and yes your patch fixes it for me too. Thanx!
(And of the other two issues mentioned in the next posting,
http://lists.freebsd.org/pipermail/freebsd-current/2009-June/008711.html
the tdq_notify trap appears to be solved, but the ata issue was never
fixed, I had to work around it by putting the affected optical drive
on a pcie sata card driven by siis(4).)
Cheers,
Juergen
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