port-vax/56383: KA630 slow clock drift

[JMoyer%NODOMAIN.NET@localhost]

>Number:         56383
>Category:       port-vax
>Synopsis:       KA630 slow clock drift
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    port-vax-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Aug 31 03:00:00 +0000 2021
>Originator:     Josh Moyer
>Release:        9.1 and 9.2
>Organization:
NODOMAIN.NET
>Environment:
Um, some NetBSD/vax 9.x string (GENERIC (9.2) and custom (9.1))
>Description:
Clock drift (on the slow side) is a problem on the KA630 and possibly other 78032 based CPUs.  It's worse in 9.2, as compared to 9.1.  Some sample output from 9.2:

rasterloop# date
Tue Aug 17 14:30:55 PDT 2021
rasterloop# ntpdate joy
17 Aug 19:37:05 ntpdate[6160]: step time server 10.9.10.78 offset 18300.064971 sec
rasterloop# date ; ntpdate joy
Thu Aug 19 06:05:37 PDT 2021
19 Aug 19:10:32 ntpdate[1218]: step time server 10.9.10.78 offset 47071.899450 sec
rasterloop# date ; ntpdate joy
Fri Aug 20 06:43:32 PDT 2021
20 Aug 11:01:41 ntpdate[9574]: step time server 10.9.10.78 offset 15466.390841 sec
rasterloop# date ; ntpdate joy
Sun Aug 22 04:49:54 PDT 2021
22 Aug 20:22:36 ntpdate[9954]: step time server 10.9.10.78 offset 55939.545922 sec
rasterloop# date ; ntpdate joy
Mon Aug 23 05:55:50 PDT 2021
23 Aug 09:29:14 ntpdate[17750]: step time server 10.9.10.78 offset 12778.557073 sec
rasterloop# date ; ntpdate joy
Thu Aug 26 07:23:11 PDT 2021
27 Aug 09:25:17 ntpdate[28412]: step time server 10.9.10.78 offset 93682.988441 sec
rasterloop# date ; ntpdate joy
Sun Aug 29 05:57:44 PDT 2021
29 Aug 22:25:48 ntpdate[10621]: step time server 10.9.10.78 offset 59237.084772 sec
rasterloop#
>How-To-Repeat:
Run NetBSD/vax 9.2 on a KA630.  Maybe with dual qe*'s or something...
>Fix:
I don't have bandwidth to investigate at the moment.