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Subject: Re: scheduler (sched_4bsd) questions
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>
>
>Great news ! - I actually switched target machines just when this
>started to happen and thought the cdrom of the new target was bad and
>disconnected it ;-)
>
>I reconnected it this morning and did a little debugging.
>Looks like an interrupt race condition in the ata code.
>Can you try the following patch?
>

awsome!
----------------
ad0: 9541MB <ST310211A/3.39> [19386/16/63] at ata0-master UDMA100
ATAPI_RESET time = 50us
acd0: CDROM <CDU5211/YYS2> at ata1-master PIO4
Mounting root from ufs:/dev/ad0s1a
------------------

notice there is still a single reset message, that doesn't appear 
without PREEMPTION
but now boots take less than 5 minutes :-)