cvs commit: src/sys/sparc64/sparc64 machdep.c
phk at phk.freebsd.dk
Thu Sep 30 12:09:28 PDT 2004
In message <200409301438.i8UEcx89022771 at repoman.freebsd.org>, Ken Smith writes:
>kensmith 2004-09-30 14:38:59 UTC
> FreeBSD src repository
> Modified files:
> sys/sparc64/sparc64 machdep.c
> This along with v1.6 of counter.c fixes some timecounter issues on
> MP machines (hopefully). CPU timers are OK on UP machines but we
> don't keep the timers in sync on MP machines so if the CPU's timer
> is chosen as the primary timecounter it's possible for time to
> not be monotonically increasing because different CPU's counters
> may be used at different times. But the CPU's counters are otherwise
> one of the higher quality counters available. So, on UP machines
> we'll use a relatively high quality value but on MP machines we'll
> use a quality that should prevent the CPU's counters from being chosen.
The 'microsecond clock' is present in all suns so we don't leave any
machines without timecounters, right ?
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