Re: Timekeeping hosed by factor 3, high lapic[01] interrupt rates

From: Jens Schweikhardt (schweikh_at_schweikhardt.net)
Date: 06/30/05

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    Date: Thu, 30 Jun 2005 00:01:51 +0200
To: John Baldwin <jhb@FreeBSD.org>

    John et al,

    # Well, that's certainly weird. I got those types of numbers (~40 secs) when I
    # was using the broken patch. Without any patches at all, my adjustments were
    # -100 seconds, not +40. There probably should be at least some difference
    # between unpatched and patched. For the sake of my sanity, can you please
    # build a GENERIC kernel from scratch without any patches and capture the above
    # output

            (last cvsup about 2 weeks ago)
            Script started on Wed Jun 29 23:45:39 2005
            # uname -a
            FreeBSD hal9000.schweikhardt.net 6.0-CURRENT FreeBSD 6.0-CURRENT #0: Wed Jun 29 23:32:05 CEST 2005 toor@hal9000.schweikhardt.net:/share/HEAD/obj/share/HEAD/src/sys/GENERIC i386
            # /etc/rc.d/ntpd stop
            Stopping ntpd.
            # ntpdate 192.53.103.103; sleep 10; ntpdate 192.53.103.103
            29 Jun 23:46:28 ntpdate[620]: adjust time server 192.53.103.103 offset -0.408871 sec
            29 Jun 23:46:39 ntpdate[622]: adjust time server 192.53.103.103 offset -0.407218 sec
            # sysctl kern.timecounter.hardware=i8254
            kern.timecounter.hardware: TSC -> i8254
            # ntpdate 192.53.103.103; sleep 10; ntpdate 192.53.103.103
            29 Jun 23:47:01 ntpdate[624]: step time server 192.53.103.103 offset 1.356553 sec
            29 Jun 23:48:02 ntpdate[626]: step time server 192.53.103.103 offset 50.226572 sec
            # sysctl kern.timecounter.hardware=TSC
            kern.timecounter.hardware: i8254 -> TSC
            # ntpdate 192.53.103.103; sleep 10; ntpdate 192.53.103.103
            29 Jun 23:48:10 ntpdate[628]: step time server 192.53.103.103 offset 3.169196 sec
            29 Jun 23:48:21 ntpdate[630]: adjust time server 192.53.103.103 offset 0.001696 sec
            Script done on Wed Jun 29 23:48:31 2005

    # and then apply http://www.FreeBSD.org/~jhb/patches/i8254_lapic.patch
    # and rebuild and capture the same output again?

    404. There's only a lapic_timer.patch dated 14-Jan-2005 20:29...
    Please don't lose your sanity :-)

    Regards,

            Jens 

    -- 
Jens Schweikhardt http://www.schweikhardt.net/
SIGSIG -- signature too long (core dumped)
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