Subject: Re: Clock drift on Miatas
To: None <firstname.lastname@example.org>
From: Hal Murray <email@example.com>
Date: 05/29/2000 01:45:55
[From Jason R Thorpe]
> NetBSD doesn't use this, I'm pretty sure. It just knows that the clock
> interrupts 1024 times a second and goes from there.
Thanks. That means the system has to see all the timer interrupts.
(or the clock slips, like I'm seeing)
The -current version of kern_clock.c has the timer interrupt processing
split between hardclock and softclock.
Can somebody give me a quick lesson in interrupts? Or tell me where
The only way that I can see for the hard/soft split to make sense
requires that the "hard" part of the timer interrupt be able to interrupt
network interrupt code and anything else that might run for a long
time. (The alternative is to make sure that no interrupt routine
runs "too long", and I haven't seen anything like that. But maybe
I wasn't looking in the right place.)
Is there a list of what devices/code run at what level?