Date: Wed, 24 Sep 1997 12:45:37 -0700 From: Wayne Scott <wscott@ichips.intel.com> To: freebsd-smp@freebsd.org Subject: SMP kernel loses timer interrupts Message-ID: <199709241945.MAA06356@pdxlx008.jf.intel.com>
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This is probably obvious when you think about it, but I am finding that when I run a SMP kernel under heavy load I lose a lot of timer interrupts. I started running xntpd the other night and it locked on a tracked our GPS reciever very closly. But during the day when I started using the machine for very heavy cpu work I found that xntpd was totally unable to keep the clock synchronized. Sep 24 11:04:38 pdxlx008 xntpd[842]: Previous time adjustment didn't complete Sep 24 11:20:18 pdxlx008 xntpd[842]: time reset (step) 3.634986 s Sep 24 11:27:46 pdxlx008 xntpd[842]: time reset (step) 1.293589 s Sep 24 11:35:14 pdxlx008 xntpd[842]: time reset (step) 1.291778 s Sep 24 11:42:42 pdxlx008 xntpd[842]: time reset (step) 0.858847 s Sep 24 11:50:10 pdxlx008 xntpd[842]: time reset (step) 1.226982 s Sep 24 11:57:38 pdxlx008 xntpd[842]: time reset (step) 1.285231 s Sep 24 12:05:06 pdxlx008 xntpd[842]: time reset (step) 1.092863 s Sep 24 12:12:34 pdxlx008 xntpd[842]: time reset (step) 1.336681 s Sep 24 12:18:58 pdxlx008 xntpd[842]: time reset (step) 0.861123 s Sep 24 12:26:00 pdxlx008 xntpd[842]: Previous time adjustment didn't complete If fact on two occasions xntpd got so confused that it just stopped my system clock. The date was 4:51:36 for 12 hours. 'gmake' really doesn't work well when time stops. I hope this will be fixed when FreeBSD support multiple kernel locks. I am current running with the 8/27 kernel. I also tried the ~9/11 kernel. -Wayne
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