Date: Wed, 23 May 2001 10:59:25 -0400 From: Vivek Khera <khera@kcilink.com> To: questions@freebsd.org Subject: how to improve a bad timekeeper Message-ID: <15115.53325.566433.473253@onceler.kciLink.com>
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I have one 4.3-STABLE box that is a really bad timekeeper. ntpd has a
hard time keeping it in line. Often offset is high, and I see loss of
synchronization frequently.
The system boot message is below.
I've tried the following to work around the bad timekeeping:
1) set kern.timecounter.method=1 (didn't help)
2) add apm0 to the kernel config (helps somewhat)
Still, the time is offset about between 0.7 and 1.4 seconds from the
two ntp servers to which I synchronize (both on my network). Without
apm0 device, it was going as far as 30 seconds off.
The machine only does backup mail and DNS, so I don't care that
microsecond timing is accurate (can I adjust the clock tick somehow)?
Are there any other things I can try to get this machine to keep
better time?
--cut here--
Copyright (c) 1992-2001 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
The Regents of the University of California. All rights reserved.
FreeBSD 4.3-STABLE #1: Tue May 22 22:35:18 EDT 2001
vivek@lorax.kciLink.com:/u/lorax1/usr/obj/u/lorax1/usr/src/sys/LORAX
Timecounter "i8254" frequency 1193182 Hz
CPU: Pentium/P54C (198.96-MHz 586-class CPU)
Origin = "GenuineIntel" Id = 0x52c Stepping = 12
Features=0x1bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8>
real memory = 134217728 (131072K bytes)
avail memory = 127967232 (124968K bytes)
Preloaded elf kernel "kernel" at 0xc02bb000.
Intel Pentium detected, installing workaround for F00F bug
apm0: <APM BIOS> on motherboard
apm: found APM BIOS v1.1, connected at v1.1
npx0: <math processor> on motherboard
npx0: INT 16 interface
pcib0: <Host to PCI bridge> on motherboard
pci0: <PCI bus> on pcib0
isab0: <Intel 82371SB PCI to ISA bridge> at device 7.0 on pci0
isa0: <ISA bus> on isab0
pci0: <Intel PIIX3 ATA controller> at 7.1
de0: <Digital 21140 Fast Ethernet> port 0x6000-0x607f mem 0xe0800000-0xe080007f irq 5 at device 17.0 on pci0
de0: DEC DE500-XA 21140 [10-100Mb/s] pass 1.2
de0: address 00:00:f8:03:1e:19
pci0: <S3 Trio graphics accelerator> at 18.0 irq 9
bt0: <Buslogic Multi-Master SCSI Host Adapter> port 0x6100-0x6103 mem 0xe0801000-0xe0801fff irq 10 at device 19.0 on pci0
bt0: BT-948 FW Rev. 5.05R Ultra Narrow SCSI Host Adapter, SCSI ID 7, 192 CCBs
sis0: <NatSemi DP83815 10/100BaseTX> port 0x6200-0x62ff mem 0xe0802000-0xe0802fff irq 11 at device 20.0 on pci0
sis0: Ethernet address: 00:02:e3:15:61:04
miibus0: <MII bus> on sis0
ukphy0: <Generic IEEE 802.3u media interface> on miibus0
ukphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
fdc0: <NEC 72065B or clone> at port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on isa0
fdc0: FIFO enabled, 8 bytes threshold
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
vga0: <Generic ISA VGA> at port 0x3b0-0x3df iomem 0xa0000-0xbffff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x100>
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 16550A, console
sio1 at port 0x2f8-0x2ff irq 3 on isa0
sio1: type 16550A
IP packet filtering initialized, divert disabled, rule-based forwarding disabled, default to accept, unlimited logging
Waiting 5 seconds for SCSI devices to settle
de0: enabling 10baseT port
Mounting root from ufs:/dev/da0s1a
da0 at bt0 bus 0 target 0 lun 0
da0: <SEAGATE ST31055N 0532> Fixed Direct Access SCSI-2 device
da0: 10.000MB/s transfers (10.000MHz, offset 15), Tagged Queueing Enabled
da0: 1010MB (2069860 512 byte sectors: 64H 32S/T 1010C)
da1 at bt0 bus 0 target 1 lun 0
da1: <SEAGATE ST32550N 0021> Fixed Direct Access SCSI-2 device
da1: 10.000MB/s transfers (10.000MHz, offset 15), Tagged Queueing Enabled
da1: 2047MB (4194058 512 byte sectors: 128H 32S/T 1023C)
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