On Thu, Jul 07, 2011 at 07:39:05PM +1000, Aristedes Maniatis wrote: > We upgraded an existing system to a new motherboard/CPU and found that timing > in various programs is very odd. For example "top" only updates every 10 > seconds instead of every second. And this confirms the oddness: > > # while true; do echo `date`; sleep 1; done > Thu Jul 7 19:09:01 EST 2011 > Thu Jul 7 19:09:11 EST 2011 > Thu Jul 7 19:09:21 EST 2011 > > 10 seconds instead of 1. > > > So I looked first at the kernel timers: > > # dmesg | grep -i time > Timecounter "i8254" frequency 1193182 Hz quality 0 > Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000 > acpi_timer0: <24-bit timer at 3.579545MHz> port 0x808-0x80b on acpi0 > pci3: <multimedia, HDA> at device 0.1 (no driver attached) > atrtc0: <AT realtime clock> port 0x70-0x71 irq 8 on acpi0 > acpi_hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on acpi0 > Timecounter "HPET" frequency 14318180 Hz quality 900 > Timecounters tick every 1.000 msec > > > I switched i8254 and then to HPET. No difference. > > # sysctl -w kern.timecounter.hardware=i8254 > kern.timecounter.hardware: ACPI-fast -> i8254 > # while true; do echo `date`; sleep 1; done > Thu Jul 7 19:09:40 EST 2011 > Thu Jul 7 19:09:41 EST 2011 > > I switched to TSC: > > # sysctl -w kern.timecounter.hardware=TSC > kern.timecounter.hardware: HPET -> TSC > # while true; do echo `date`; sleep 1; done > Thu Jul 7 19:25:56 EST 2011 > Thu Jul 7 19:25:57 EST 2011 > Thu Jul 7 19:25:58 EST 2011 > > Now this looks like it fixed the problem, but actually it is worse. Now the > clock matches what you'd expect, but there is still 10 seconds in real time > between those date entries. That is, now the system clock is running 10 times > too slow as well. > > > # uname -a > FreeBSD delish.ish.com.au 8.2-RELEASE FreeBSD 8.2-RELEASE #0: Thu Feb 17 > 02:41:51 UTC 2011 r...@mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC > amd64 > > Base board information > Manufacturer: ASUSTeK Computer INC. > Product Name: P6X58D-E > > BIOS information > Vendor: American Megatrends Inc. > Version: 0502 > Release Date: 11/16/2010 > BIOS Revision: 8.15 > > CPU Model: Intel(R) Core(TM) i7 CPU 960 @ 3.20GHz
Do you have anything like powerd(8) enabled, or EIST / Intel SpeedStep technology enabled in your system BIOS? If so, can you try disabling powerd and/or disabling EIST/SS? Alternately, and this isn't to say FreeBSD doesn't have a problem, do you have a replacement/spare motherboard you can try? There's always the possibility that you have a bad crystal on the motherboard and a replacement board would rule that out. -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, US | | Making life hard for others since 1977. PGP 4BD6C0CB | _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
