Re: clock works slowly when I change CPU speed

 On Sat, 16 Aug 2003 10:25:33 +0200 "Poul-Henning Kamp" wrote:
| In message <20030816.120621.846933691.matoba_at_st.rim.or.jp>, MATOBA Hirozumi wri
| tes:
| > On Fri, 15 Aug 2003 22:50:47 +0200 Thorsten Greiner wrote:
| >| $ dmesg | grep counter
| >| Timecounter "i8254"  frequency 1193182 Hz
| >| Timecounter "ACPI-fast"  frequency 3579545 Hz
| >| Timecounter "TSC"  frequency 1595302164 Hz
| >| $ sysctl -w kern.timecounter.hardware=i8254
| >| Fixes the problem for me. I suspect you should set this in
| >| /etc/sysctl.conf to enable it permanently.
| >Thank you for your advice. 
| I've given timecounters "qualities" which should solve this problem.

Thank you. 

I searched in cvs-all mailing-list archive about it, 
and found at:

    Message-Id: <200308160823.h7G8NrAv045177_at_repoman.freebsd.org>
    From: Poul-Henning Kamp <phk_at_FreeBSD.org>
    Date: Sat, 16 Aug 2003 01:23:53 -0700 (PDT)
    Subject: cvs commit: src/sys/sys timetc.h src/sys/kern kern_tc.c
     src/sys/dev/acpica acpi_timer.c src/sys/i386/i386 tsc.c
     src/sys/i386/isa clock.c

Then I did cvsup on Date: 16 Aug 2003 17:55 +900 (JST) on my ThinkPad A22e, 
and checked :
    the value of kern.timecounter.hardware is ACPI-fast
                        (without changing by sysctl -w)
    the clock works normally at any CPU settings
                                   (hw.acpi.cpu)


    $ dmesg | grep counter
        Timecounter "i8254" frequency 1193182 Hz quality 0
        Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
        Timecounter "TSC" frequency 797050143 Hz quality 800
        Timecounters tick every 10.000 msec

    $ sysctl kern.timecounter
        kern.timecounter.nbinuptime: 105755
        kern.timecounter.nnanouptime: 3
        kern.timecounter.nmicrouptime: 635
        kern.timecounter.nbintime: 38493
        kern.timecounter.nnanotime: 5
        kern.timecounter.nmicrotime: 38488
        kern.timecounter.ngetbinuptime: 0
        kern.timecounter.ngetnanouptime: 4
        kern.timecounter.ngetmicrouptime: 4186
        kern.timecounter.ngetbintime: 0
        kern.timecounter.ngetnanotime: 18
        kern.timecounter.ngetmicrotime: 30494
        kern.timecounter.nsetclock: 3
        kern.timecounter.hardware: ACPI-fast
        kern.timecounter.choice: TSC(800) ACPI-fast(1000) i8254(0) dummy(-1000000)
        kern.timecounter.tick: 1

    files:

        /boot/loader.conf.local:
            hint.acpi.0.disabled="0"
            hint.apm.0.disabled="1"
            hw.acpi.verbose="1"
            hw.ata.atapi_dma="1"
            if_fxp_load="YES"
            snd_ich_load="YES"

        /etc/sysctl.conf:
            hw.acpi.lid_switch_state=NONE
            hw.acpi.suspend_state=NONE
            hw.acpi.sleep_delay=5
            hw.acpi.cpu.performance_speed=4

        kernel config file:
            alomost the same as GENERIC, 
            except for commented out Ethernet drivers
                (all the lines from "device de" to "device wi", 
                 and two lines "device aue","device axe")

-- 
matoba_at_st.rim.or.jp