Subject: Re: clock accuracy
To: None <kita@koganei.wide.ad.jp>
From: Ken Nakata <knakata@itpjp.co.jp>
List: port-mac68k
Date: 02/22/1999 15:02:11
On Mon, 22 Feb 1999 14:53:01 +0900, KITAMURA Yasuichi wrote:
> I installed 1.3.3 on my SE/30 and it works very well except one point. The
> issue is the clock or time accuracy. The clock of the SE/30 is as accurate
> as other Macintoshes, I think, on MacOS(7.5.5:-)). The time difference from
> the NTP server is about 3 sec in maximum. But when I switch to NetBSD, the
> accuracy goes down. The time differenece from an NTP server is about 20
> minutes per a week.
This is a long-standing known problem, due to the hardware design
decision Apple engineers took. Basically, the clock interrupt does
not have the priority high enough to keep the time accurate. This is
a problem seen only on the mac68k port and not on the others AFAIK.
Ken