Re: cvs commit: src/sys/i386/i386 mp_machdep.c src/sys/i386/isa clock.c src/sys/kern kern_ktr.c src/sys/sys ktr.h

[Sascha Wildner <saw@xxxxxxxxx>]

Matthew Dillon wrote:
> dillon      2005/12/06 15:37:55 PST
>
> DragonFly src repository
>
>   Modified files:
>     sys/i386/i386        mp_machdep.c 
>     sys/i386/isa         clock.c 
>     sys/kern             kern_ktr.c 
>     sys/sys              ktr.h 
>   Log:
>   Synchronize the TSC between all cpus on startup and provide a sysctl,
>   debug.ktr.resynchronize, which will (very expensively) resynchronize the
>   TSCs 10 times a second to reduce drift errors to manageable numbers.
>   
>   The TSC on all the cpus for the purposes of ktrdump's ought to be
>   synchronizated within ~200ns of each other, assuming all cpus are running
>   at the same frequency.
>   
>   This needs more work.  What we really need to do is calculate the drift
>   for each cpu and apply it dynamically.
>   
>   Revision  Changes    Path
>   1.49      +17 -1     src/sys/i386/i386/mp_machdep.c
>   1.44      +11 -5     src/sys/i386/isa/clock.c
>   1.7       +98 -2     src/sys/kern/kern_ktr.c
>   1.8       +1 -1      src/sys/sys/ktr.h

This breaks UP buildkernel here since the extern declaration of 
tsc_offsets is inside #ifdef SMP but referenced outside.

I was about to back out the change in ktr_write_entry() but in the end I 
wasn't sure enough.

Sascha