Timekeeping hosed by factor 3, high lapic[01] interrupt rates
John Baldwin
jhb at FreeBSD.org
Thu Jun 30 17:43:20 GMT 2005
On Wednesday 29 June 2005 06:01 pm, Jens Schweikhardt wrote:
> 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 at 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
Hmm, about 50 seconds there.
> # 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 :-)
Ah, uploading it now.
--
John Baldwin <jhb at FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve" = http://www.FreeBSD.org
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