Easy now, there is more depth to it than that...  I have promised myself
to get the timecounter paper written and I'll probably present it at
BSDcon-euro-2002 in Amsterdam if they want to listen to me.

For now, lets concentrate on the PIIX hardware because that's where
the problem seems to be...


In message <[EMAIL PROTECTED]>, Matthew Dillon wri
>    Ok, I've looked at the code more carefully and I understand how this
>    works now.  However, it is not enough in an SMP environment.  You
>    need a generation count in the timecounter structure and you also need
>    a synchronization point when you switch time counters or a process
>    running on a different cpu may wind up using a time counter that is being
>    actively updated.
>    I'm experimenting with your patch now.  I'll send email when I have 
>    some test results.
>                                               -Matt
>:I just wrote the following fix for some of the overflow problems.
>:Index: kern_tc.c
>:RCS file: /home/ncvs/src/sys/kern/kern_tc.c,v
>:retrieving revision 1.113
>:diff -c -2 -r1.113 kern_tc.c
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