Date: Thu, 29 Jun 2000 19:22:45 +0200 From: Wilko Bulte <wkb@chello.nl> To: Mike Smith <msmith@FreeBSD.ORG> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: microuptime() going backwards Message-ID: <20000629192245.A1456@freebie.wbnet> In-Reply-To: <200006290633.XAA01381@mass.osd.bsdi.com>; from msmith@FreeBSD.ORG on Wed, Jun 28, 2000 at 11:33:53PM -0700 References: <200006280321.UAA00490@mass.osd.bsdi.com> <200006290633.XAA01381@mass.osd.bsdi.com>
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On Wed, Jun 28, 2000 at 11:33:53PM -0700, Mike Smith wrote: > > > > System is an Athlon 700Mc, dmesg.boot available if required. > > > > > > > > Any idea what is causing this? > > > > > > Yup. Is this an Epox board? I think it's a bug in the APM code. It > > > even bites if APM is disabled. Try completely removing APM from the > > > kernel. > > > > I explained this to you at Usenix, actually. It has nothing to do with > > APM, it has to do with the selection of clocks available with/without APM > > compiled into the kernel - there is probably either a bug in the TSC > > hardware on this CPU, or (more likely) a bug in the timecounter code > > (since people see this on !APM systems already). > > s/TSC hardware/i8254 hardware/ > > (the TSC is disabled when APM is compiled in, and this forces the use of > the i8254) Allow me a silly question: what is the TSC exactly? Probably something in the CPU per: CPU: AMD Athlon(tm) Processor (700.03-MHz 686-class CPU) Origin = "AuthenticAMD" Id = 0x621 Stepping = 1 Features=0x183f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PA T,PSE36,MMX,FXSR> AMD Features=0xc0400000<AMIE,DSP,3DNow!> -- Wilko Bulte http://www.freebsd.org "Do, or do not. There is no try" wilko@freebsd.org http://www.nlfug.nl Yoda - The Empire Strikes Back To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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