Date: Sun, 7 Sep 1997 18:54:20 -0700 (PDT) From: "Jamil J. Weatherbee" <jamil@counterintelligence.ml.org> To: Hoffmann Yen-Wei Liu <ywliu1@tao.sinanet.com.tw> Cc: question@FreeBSD.ORG, hackers@FreeBSD.ORG Subject: Re: Kernel clock runs inaccurately Message-ID: <Pine.BSF.3.96.970907185323.997B-100000@counterintelligence.ml.org> In-Reply-To: <199709080124.JAA14004@tao.sinanet.com.tw>
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I don't think this has any bearing on the problem but if you are connected to a network run xntpd to keep gettimeofday() clock synced with a master server (like the navy or something) On Mon, 8 Sep 1997, Hoffmann Yen-Wei Liu wrote: > Hi, > > Sorry, I don't know if this question fits in questions or hackers > mailing list. > > I just got myself a new AMD k6-200, and I found out a major problem : > it runs about 30 seconds faster per day. So two days later, it runs > 2 minutes faster. However, the CMOS clock runs around 2 seconds slower > per day. This is acceptable to me. > > After fooling around with CLK_USE_I8254_CALIBRATION and > CLK_USE_I586_CALIBRATION options, I can either make it run 2 seconds slower > per *hour*, or several seconds faster per minutes, but not to a acceptably > inaccurate ranage. The boot verbose flag gives me the following figure inf: > > ... > Calibrating clock(s) ... i586 clock: 199932094 Hz, i8254 clock: 1194681 Hz > Calibrating clock(s) ... i586 clock: 199931374 Hz, i8254 clock: 1194663 Hz > CPU: AMD K6 (199.93-MHz 586-class CPU) > Origin = "AuthenticAMD" Id = 0x561 Stepping=1 > Features=0x8001bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8> > ... > > > Also, even looking into isa/i386/clock.c cannot give me too many clues. > > In a word, > > 1) I know Pentium motherboard clock isn't accurate. But is there any workaround > for me to set options or modify clock.c to make the kernel clock runs in > a acceptably inaccurate range ? > > 2) Does changing to a new motherboard with better quality help ? > > 3) I run OSS/FreeBSD commercial sound driver. Does this possibly matter ? > > > THanks for your attention. > > > Yen-Wei Liu >
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