Date: Tue, 28 Jun 2005 23:07:49 +0200 From: Jens Schweikhardt <schweikh@schweikhardt.net> To: John Baldwin <jhb@FreeBSD.org> Cc: freebsd-current@FreeBSD.org, phk@FreeBSD.org Subject: Re: Timekeeping hosed by factor 3, high lapic[01] interrupt rates Message-ID: <20050628210749.GA763@schweikhardt.net> In-Reply-To: <200506271529.22790.jhb@FreeBSD.org> References: <20050516113420.GA786@schweikhardt.net> <200506241528.44124.jhb@FreeBSD.org> <20050624224107.GA778@schweikhardt.net> <200506271529.22790.jhb@FreeBSD.org>
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John et al, # Forget SMP and go back to UP for now. Turn off ntpd if you are using it, then # do something like this: # # # ntpdate ntp.xxxx ; sleep 10 ; ntpdate ntp.xxxx # # And try it both with the timecounter set to TSC and with the timecounter set # to i8254. Here we go, kernel with your second patch, boot with kern.smp.disabled=1. Script started on Tue Jun 28 22:53:10 2005 # /etc/rc.d/ntpd stop Stopping ntpd. # sysctl kern.smp.disabled kern.smp.disabled: 1 # sysctl -a|grep timec kern.timecounter.stepwarnings: 0 kern.timecounter.nbinuptime: 116095 kern.timecounter.nnanouptime: 0 kern.timecounter.nmicrouptime: 670 kern.timecounter.nbintime: 902 kern.timecounter.nnanotime: 24 kern.timecounter.nmicrotime: 880 kern.timecounter.ngetbinuptime: 410 kern.timecounter.ngetnanouptime: 24 kern.timecounter.ngetmicrouptime: 2337 kern.timecounter.ngetbintime: 0 kern.timecounter.ngetnanotime: 0 kern.timecounter.ngetmicrotime: 5 kern.timecounter.nsetclock: 2 kern.timecounter.hardware: TSC kern.timecounter.choice: TSC(800) i8254(0) dummy(-1000000) kern.timecounter.tick: 1 kern.timecounter.smp_tsc: 0 # ntpdate 192.53.103.103; sleep 10; ntpdate 192.53.103.103 28 Jun 22:54:31 ntpdate[606]: adjust time server 192.53.103.103 offset 0.275702 sec 28 Jun 22:54:41 ntpdate[608]: adjust time server 192.53.103.103 offset 0.267708 sec # sysctl kern.timecounter.hardware=i8254 kern.timecounter.hardware: TSC -> i8254 # ntpdate 192.53.103.103; sleep 10; ntpdate 192.53.103.103 28 Jun 22:55:16 ntpdate[621]: step time server 192.53.103.103 offset 8.265734 sec 28 Jun 22:56:16 ntpdate[623]: step time server 192.53.103.103 offset 49.488049 sec # ntpdate 192.53.103.103; sleep 10; ntpdate 192.53.103.103 28 Jun 22:56:50 ntpdate[624]: step time server 192.53.103.103 offset 27.732229 sec 28 Jun 22:57:49 ntpdate[626]: step time server 192.53.103.103 offset 48.679758 sec # sysctl kern.timecounter.hardware=TSC kern.timecounter.hardware: i8254 -> TSC # ntpdate 192.53.103.103; sleep 10; ntpdate 192.53.103.103 28 Jun 22:57:59 ntpdate[628]: step time server 192.53.103.103 offset 2.417985 sec 28 Jun 22:58:10 ntpdate[630]: adjust time server 192.53.103.103 offset -0.008257 sec # ntpdate 192.53.103.103; sleep 10; ntpdate 192.53.103.103 28 Jun 22:58:23 ntpdate[631]: adjust time server 192.53.103.103 offset -0.005786 sec 28 Jun 22:58:33 ntpdate[633]: adjust time server 192.53.103.103 offset -0.004015 sec # Script done on Tue Jun 28 22:58:38 2005 Regards, Jens -- Jens Schweikhardt http://www.schweikhardt.net/ SIGSIG -- signature too long (core dumped)
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