Date: Mon, 8 Sep 1997 09:24:11 +0800 (CST) From: Hoffmann Yen-Wei Liu <ywliu1@tao.sinanet.com.tw> To: question@freebsd.org Cc: hackers@freebsd.org Subject: Kernel clock runs inaccurately Message-ID: <199709080124.JAA14004@tao.sinanet.com.tw>
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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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