Hi everyone,
I've been experiencing some terrible clock skew and just can't figure it out. By terrible I mean I'm losing 30 minutes a day. The loss only occurs when I bring the system under heavy load. The load is multiple Rsync backups to a ZFS pool(with gzip compression) backed by a 16 disk Raid50. I'm using a hardware Raid controller for battery backed write caching.
Mobo: Supermicro X8DTL
CPU: Dual Intel 5620 quad cores
Raid: Areca 1620
I have ntp enabled but the skew happens to fast and it stops trying. I've tried a bunch of stuff from the various lists. I tried all my clock sources. TSC(-100) HPET(900) ACPI-fast(1000) i8254(0). I tried changing the kern.hz flag lower. I also tried disabling the enhanced speed step feature of this chip. Nothing works.
Currently I'm defaults except the following settings.
EIST Disabled in BIOS
kern.hz="100"
kern.timecounter.hardware=i8254
Is there anything else I could do to debug this? I can't really blame the hardware because I have these same boards/chips running in Linux with no clock issues.
Thanks!
Dave
I've been experiencing some terrible clock skew and just can't figure it out. By terrible I mean I'm losing 30 minutes a day. The loss only occurs when I bring the system under heavy load. The load is multiple Rsync backups to a ZFS pool(with gzip compression) backed by a 16 disk Raid50. I'm using a hardware Raid controller for battery backed write caching.
Mobo: Supermicro X8DTL
CPU: Dual Intel 5620 quad cores
Raid: Areca 1620
I have ntp enabled but the skew happens to fast and it stops trying. I've tried a bunch of stuff from the various lists. I tried all my clock sources. TSC(-100) HPET(900) ACPI-fast(1000) i8254(0). I tried changing the kern.hz flag lower. I also tried disabling the enhanced speed step feature of this chip. Nothing works.
Currently I'm defaults except the following settings.
EIST Disabled in BIOS
kern.hz="100"
kern.timecounter.hardware=i8254
Is there anything else I could do to debug this? I can't really blame the hardware because I have these same boards/chips running in Linux with no clock issues.
Thanks!
Dave