cpu-timer rate

[Kevin Oberman]

> Date: Mon, 5 Dec 2005 13:47:56 -0600
> From: "Matthew D. Fuller" <fullermd at over-yonder.net>
> 
> On Mon, Dec 05, 2005 at 10:15:52AM -0800 I heard the voice of
> Kevin Oberman, and lo! it spake thus:
> > > From: "Matthew D. Fuller" <fullermd at over-yonder.net>
> > > 
> > > Because the rate is always twice hz.
> > 
> > While I will concede that I have no explanation, but on all of my
> > systems rate = HZ +/-1. I have never seen a case where rate/2 = HZ.
> 
> Well, OK, it always is when you're using the LAPIC timer, which I
> think is on 6.x and up (with the APIC enabled, of course).  When
> you're using irq0, it just runs at hz.

That would explain it. While most of the systems in question are V6 or
V7, none is multi-processor and, being conservative, I don't run APIC
on any of them. (An exception is my -current system, but it locks up on
boot with APIC enabled.)

Maybe I should try it some time just to see what happens. ;-)

Thanks.
-- 
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at es.net			Phone: +1 510 486-8634