kern/41226: system delay with Core2Duo and TSC

[jun%soum.co.jp@localhost]

>Number:         41226
>Category:       kern
>Synopsis:       system delay with Core2Duo and TSC
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Apr 16 06:20:00 +0000 2009
>Originator:     Jun Ebihara
>Release:        5.99.10
>Organization:
SOUM Corporation
>Environment:
NetBSD XXX 5.99.10 NetBSD 5.99.10 (GENERIC) #9: Thu Apr 16 08:44:09 JST 2009  
XXX%XXX.XXX.co.jp@localhost:/usr/obj/amd64/sys/arch/amd64/compile/GENERIC amd64

>Description:
With Core2Duo 2.4G(IBM System x3250 M2),
system clock delay 0.5 second between every 1 second.

On NetBSD 5.99.3 (GENERIC) #5: Sat Nov 29 15:00:16 JST 2008
cpu0 at mainbus0 apid 0: Intel 686-class, 2400MHz, id 0x6fd
timecounter: Timecounter "TSC" frequency 2400120360 Hz quality 3000

On NetBSD 5.99.10 (GENERIC) #9: Thu Apr 16 08:44:09 JST 2009
cpu0 at mainbus0 apid 0: Intel 686-class, 4800MHz, id 0x6fd
timecounter: Timecounter "TSC" frequency 4800139080 Hz quality 3000

after timecounter setting change from TSC to ACPI-FAST,
that problem had fixed.



>How-To-Repeat:
# ntpdate NTP-server ; sleep 2 ; ntpdate NTP-server
16 Apr 14:46:11 ntpdate[17107]: step time server NTP-server offset 1.077341 sec

>Fix:
# sysctl -w kern.timecounter.hardware=ACPI-Fast
# ntpdate NTP-server ; sleep 2 ; ntpdate NTP-server
16 Apr 15:13:52 ntpdate[17901]: adjust time server NTP-server offset 0.001068 
sec