Date: Sat, 10 May 2008 20:58:28 +1000 (EST) From: Bruce Evans <brde@optusnet.com.au> To: Jeffrey Brower <Jeff@PointHere.net> Cc: freebsd-i386@freebsd.org Subject: Re: i386/104867: Clock running at 2x speed of wall clock Message-ID: <20080510204712.V2970@besplex.bde.org> In-Reply-To: <200805100030.m4A0U4g2010514@freefall.freebsd.org> References: <200805100030.m4A0U4g2010514@freefall.freebsd.org>
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On Sat, 10 May 2008, Jeffrey Brower wrote: > I verified that the timecounter was indeed i8254 after I recompiled with > that option and it still ran double time. With the i8254 and precisely double time, just type in the correct (doubled) freqency to "sysctl machdep.i8254_freq=..." With the APCI-fast timecounter, first fix the bug that the corresponding sysctl is read-only. > Everything I tried failed - even NTP gave up because it was constantly > slewing. No one could solve it and I never got an answer so I ended up NTP can't reasonably handle a 2x error in the clock frequency. Nor can fixing a 2x error work if the error is transient. Bruce
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