Timekeeping hosed by factor 3, high lapic[01] interrupt rates
Jens Schweikhardt
schweikh at schweikhardt.net
Wed Jun 29 22:02:09 GMT 2005
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
# 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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