On Sat, 25 Aug 2001, Mike Smith wrote:
> It should be a tunable, not a compile-time option.
>
> > David Hill wrote:
> > >
> > > Hello -
> > > Could someone please document "options HZ" into LINT?. I found it whil
> > e
> > > reading the dummynet(4) manpage.
It must remain a compile-time option for those of us who don't believe
in tunables.
Notes:
- Making HZ non-constant (almost everything uses `hz' instead of HZ) mainly
pessimizes time-critical code that computes hz/CONST, except:
- on alphas, the HZ option has no effect. The initial value of hz = HZ
is not used except to compute wrong values for `tick' and `tickadj'
(`tick' is fixed up later but `tickadj' remains wrong). `hz' is
initialized to hwprb->rpb_intr_freq >> 12 in alpha/machdep.c. So,
hz needs to be non-constant and the HZ option and tunables just get
in the way for alphas and for other arches where the hardclock
frequency is not programmable.
Bruce
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