kern/99765: drifting time, SuperMicro PDSMi Motherboard, "calcru negative runtime" problems

[Artem Bokhan]

>Number:         99765
>Category:       kern
>Synopsis:       drifting time, SuperMicro PDSMi Motherboard, "calcru negative runtime" problems
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Jul 04 07:50:15 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Artem Bokhan
>Release:        FreeBSD 6.1-STABLE i386
>Organization:
>Environment:
FreeBSD  6.1-STABLE FreeBSD 6.1-STABLE #1: Tue Jul  4 13:33:29 NOVST 2006     form@:/usr/obj/usr/src/sys/GENERIC  i386
>Description:
On SuperMicro SuperServer 5015M-MF with Super PDSMi Motherboard I have problems with drifting (several seconds for several minutes) time on all types of timecounters (TSC,ACPI-safe,i8254) in SMP and non-SMP modes, with acpi enabled and disabled.

Also, with ACPI-safe timecounter there are a lot of messages like:

Jul  4 14:37:34  kernel: calcru: negative runtime of -7736790 usec for pid 12 (swi4: clock sio)
Jul  4 14:37:34  kernel: calcru: negative runtime of -509284 usec for pid 516 (sshd)
Jul  4 14:37:34  kernel: calcru: negative runtime of -624737 usec for pid 421 (ntpd)
Jul  4 14:37:34  kernel: calcru: negative runtime of -1315926 usec for pid 44 (softdepflush)
Jul  4 14:37:34  kernel: calcru: negative runtime of -1018507 usec for pid 32 (irq14: ata0)
Jul  4 14:37:34  kernel: calcru: negative runtime of -1012373 usec for pid 21 (irq16: em0 uhci3)
Jul  4 14:37:34  kernel: calcru: runtime went backwards from 516063 usec to 216547 usec for pid 3 (g_up)
Jul  4 14:37:34  kernel: calcru: negative runtime of -7736785 usec for pid 12 (swi4: clock sio)
Jul  4 14:37:34  kernel: calcru: negative runtime of -509284 usec for pid 516 (sshd)
Jul  4 14:37:34  kernel: calcru: negative runtime of -624737 usec for pid 421 (ntpd)
Jul  4 14:37:34  kernel: calcru: negative runtime of -1315926 usec for pid 44 (softdepflush)

On FreeBSD 7-CURRENT everything is OK, no problems with clock with any of ACPI-safe, 
TSC or i8254 timecounters.

ps. I can provide full access to the server, if somebody could resolve the problem.
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: