Date: Sat, 12 Jun 2010 10:01:08 +1000 From: Jeff Dowsley <jeff.dowsley@mac.com> To: freebsd-stable@freebsd.org Subject: Re: "calcru: runtime went backwards" messages Message-ID: <53C5B962-676B-4787-9C84-49F70884A3A1@mac.com> In-Reply-To: <AANLkTinHSQsHZF1JdVrndP4NsDNWCBwoE_kwpm_DlUYh@mail.gmail.com> References: <AANLkTimpKW8-MyWKKo7cylqyb3sND8BGX-woMd2P5YE5@mail.gmail.com> <20100610230300.GA51804@stack.nl> <AANLkTinHSQsHZF1JdVrndP4NsDNWCBwoE_kwpm_DlUYh@mail.gmail.com>
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You're not alone. Noticed the calcru messages after a rebuild in May on a Compaq PIII, but assumed it wasn't doing any harm, and that it would eventually be fixed. JeffD _____________________________ M 0427565791 jeff.dowsley@mac.com On 11/06/2010, at 4:03 PM, Jansen Gotis wrote: > On Fri, Jun 11, 2010 at 7:03 AM, Jilles Tjoelker <jilles@stack.nl> > wrote: >> On Fri, Jun 11, 2010 at 12:35:05AM +0800, Jansen Gotis wrote: >>> Hi, for the past couple of months since moving to RELENG_8 I've been >>> receiving "calcru: runtime went backwards" messages on the console. >> > <snip> >> >> This may well be a manifestation of a brokenness (which should not be >> unknown) in how FreeBSD stores CPU time utilization. The time is >> maintained in "CPU ticks" (CPU clock cycles), so if the clock >> frequency >> changes, the values of existing processes will be wrong (a jump when >> converted to seconds). When calcru detects this, it generates >> messages >> like the above. If this analysis is right, the messages can be >> ignored, >> but indicate that CPU time statistics may be inaccurate. >> > > You're probably right, the messages can be ignored. I don't see any > issues > other than the messages being printed on the console; I don't > experience > freezing, etc. It just struck me as weird because searching the - > current and > -stable mailing lists does not show anyone else having the issue as > recently > as I have. > > Just some more info to add which I forgot about last time...setting > kern.hz to > 100 did not help. > > Thanks for the reply. > > > Best regards, > Jansen > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable- > unsubscribe@freebsd.org"
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