Date: Sun, 02 Sep 2007 21:45:02 +0200 From: Kris Kennaway <kris@FreeBSD.org> To: James Long <list@museum.rain.com> Cc: freebsd-questions@FreeBSD.org Subject: Re: Recent update to RELENG_6 creates lots of calcru warnings Message-ID: <46DB12BE.1010608@FreeBSD.org> In-Reply-To: <20070902193306.GA79850@ns.umpquanet.com> References: <20070902012446.GA17048@ns.umpquanet.com> <46DA9BED.20804@FreeBSD.org> <20070902193306.GA79850@ns.umpquanet.com>
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James Long wrote: > On Sun, Sep 02, 2007 at 01:18:05PM +0200, Kris Kennaway wrote: >> James Long wrote: >>> I'm running FreeBSD RELENG_6 on a Compaq DL380 G2 dual PIII-1.4GHz with an >>> SMP kernel. dmesg below. >>> Prior to about August 12, the system had been quite stable. >>> Since that time, I am finding lots of calcru warnings, which often >>> cause system services to fail when they see unorthodox time shifts. >>> Section 5.19 of the handbook appears not to be current any longer, >>> suggesting setting kern.timecounter.method=1. >>> kern.timecounter.hardware=i8254 also does not improve things. >>> Other suggestions? >>> Thanks, >>> Jim >>> Sep 1 18:00:30 ns sudo: james : TTY=ttyp0 ; >>> PWD=/usr/local/www/sites/com.umpquanet/support ; USER=root ; >>> COMMAND=/sbin/sysctl -w kern.timecounter.hardware=i8254 >>> Sep 1 18:02:44 ns kernel: calcru: runtime went backwards from 1343309 >>> usec to 1178478 usec for pid 3663 (hpasmd) >>> Sep 1 18:02:44 ns kernel: calcru: negative runtime of -1274607 usec for >>> pid 3660 (hpasmd) > > ... big snip ... > >> Does reverting to the older kernel work? If so, can you isolate which >> commit caused the problem by doing a binary search of date ranges? This >> should be easy to do since the rate of changes to RELENG_6 is low. >> >> Kris > > Please pardon the rookie question, but the machine is not blazingly > fast to build (circa 90 minute world, 20 min. kernel). For the > purposes of the binary search, may I build just the kernel, and would > you suggest leaving the up-to-date world and running against a > slightly older kernel as I test, or should I roll the world back to > early August, and test against a slightly new kernel -- or will it > matter? > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" > > You should only need to rebuild the kernel when searching. Kris
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